International Conference on Exotic Atoms and Related Topics - EXA2017

We propose a method of study of quantum states of antihydrogen atom in the Earth gravitational field near material surface which benefits from spectroscopy and interferometry of such states. We study the main false effects and show that the estimated accuracy of gravitational to inertial mass ratio for antihydrogen in the developed approach could be better than 0.0001 for 1000 antiatoms used. An essential increase in the precision of gravitational mass measurement is due to more than one order of magnitude increase in the lifetime of antihydrogen gravitational states above surfaces covered with liquid He film.

The integrated cross section of double polarized pd-scattering with transverse polarization of the proton ($P_y$) and tensor polarization ($P_{xz}$) of the deuteron constitutes a null-test signal of the time-invariance violating P-parity conserving (TVPC) effects $\widetilde\sigma$ [1]. Experimental search of this signal is planned at COSY at proton beam energy 135 MeV [2]. Theoretical study of the energy dependence of this signal for several type of phenomenological TVPC NN- interactions was done within the Glauber theory in [3] for the S-wave approximation and in [4] with the deuteron D-wave included. In both cases the Coulomb interaction was taken into account and its contribution to $\widetilde\sigma$ is found to be rather small. However, the S-D interference is destructive and very important [4]. Evidently, the integrated cross section of the polarized ($P_y$) antiproton scattering off the tensor polarized ($P_{xz}$) deuteron also provides a null-test signal of the TVPC effects. One may assume that TVPC $\bar NN$-interaction contains the same operator structure as the $NN$-interaction except the charge-exchange term $\bar p p\to \bar n n$.However, due to difference between strong NN- and antip N- scattering amplitudes the energy dependence of the null test signal in pd- and anti-pd- interaction has to be different. In the present work these properties will be discussed on the basis of the calculations within the spin-dependent Glauber model [5] using the \bar p N-scattering amplitudes from Ref. [6]. [1] Н.Е.Conzett, Phys. Rev. C 48 (1993) 423. [2] P.D. Eversheim, B. Lorenz, Yu.Valdau (spokepersons), COSY Proposal No 25 [http://apps.fz-juelich.de/pax/paxwiki/ images/8/8c/215-TRRI-Prop_sum.pdf] [3] Yu. N.Uzikov, A.A. Temerbayev, Phys. Rev. C 92 (2015) 014002. [4] Yu. N.Uzikov, J.H. Haidenbauer, Phys. Rev. C 94 (2016) 035501. [5] Yu. N.Uzikov, J.H. Haidenbauer, Phys. Rev. C 88 (2013) 027001. [6] D. Zhou, R.G. E. Timmermans, Phys. Rev. C 86 (2012) 044003.

Precision hyperfine spectroscopy of antihydrogen is one of the primary goals of the ALPHA experiment. In hydrogen, the zero-field ground-state hyperfine splitting frequency has been measured to better than 1 part in 10^12 [1]. A measurement of a similar precision on antihydrogen would provide an extremely precise test of CPT symmetry. An initial proof-of-principle experiment was performed in 2012 demonstrating the ability to excite positron spin resonance transitions in ground state antihydrogen [2]. In this talk, I will present the tools we have developed to study antihydrogen's hyperfine structure and the results of ALPHA's latest hyperfine spectroscopy experiments. [1] IEEE Trans. Instrum. Meas. IM-19, 200 (1970); Nature 229 110 (1970). [2] Amole et al., Nature 483, 439 (2012).

The ASACUSA Collaboration at CERNs Antiproton Decelerator plans to measure the ground state hyperfine splitting of antihydrogen with high precision to test the combined fundamental symmetry of charge conjugation, parity transformation, and time reversal. The antihydrogen atoms are created in a double CUSP trap [1], where antiprotons and positrons are mixed. The antiatoms then enter a Rabi-like spectrometer line [2] where at the end the annihilation signal is recorded by a detector which will be the focus of this contribution. The challenging task of the detector is to distiguish background events such as cosmic particles and upstream annhilations from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. The antihydrogen detector is composed of a position sensitive central detector and a surrounding hodoscope [3] for tracking charged annihilation products. The hodoscope is made up of two layers of plastic scintillators which are read out by silicon photo multipliers with pre-amplifier electronics. Its excellent time resolution allows to differentiate particles coming from inside from those traversing the detector from outside. For beamtime 2017 an upgrade has been carried out using scintillating fibres, improving the hodoscopes position resolution in beam direction and enabling tracking in three dimensions and precise vertex reconstruction. Furthermore, preliminary results of last years beamtime will be included, during which direct extractions of antiprotons to the detector have been done in order to study the antiproton annihilation signal. [1] N. Kuroda et al. (2014). A source of antihydrogen for in-flight hyperfine spectroscopy. Nature Communications, 5,3089 [2] C. Malbrunot et al. (2014). Spectroscopy apparatus for the measurement of the hyperfine structure of antihydrogen. Hyperfine Interactions, 228, 61–66 [3] C. Sauerzopf et al. (2016). Annihilation Detector for an In-Beam Spectrsocopy Apparatus to Measure the Ground State Hyperfine Splitting of Antihydrogen. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, A845, 579-582

The aim of the ALPHA experiment at CERN is to trap cold atomic antihydrogen, study its properties, and ultimately to perform precision comparison between the hydrogen and antihydrogen atomic spectra. Recently the collaboration has reached important milestones beginning with demonstrating the ability to trap and confine neutral cold antihydrogen [1][2], setting new limits on the charge of antihydrogen [3], and performing spectroscopic measurements of antihydrogen [4][5]. The principle tool for antihydrogen detection in the ALPHA experiment is a Silicon Vertex Detector (SVD) composed of 72 double-sided silicon strip hybrid modules designed to surround the neutral atom trap. Recently upgraded [7], the SVD is used to image single annihilation events, and reconstruct spatial and timing data of antiproton annihilations. The detector performance can be optimised for various physics applications. This ranges from extreme low background suppression for counting experiments, to high signal acceptance and accurate vertex reconstruction used for collective plasma behaviour studies, giving insight into the formation processes of antihydrogen. A description of the SVD performance, characteristics, and an overview of applications in the ALPHA experiment will be given. The presentation will cover a summary of recent results, improvements to analytical methods leading to near order of magnitude reduction in background signal and outlook for probing antihydrogen formation.

The recent observation of discrepancies in the muonic sector motivates searches for the yet undiscovered atom true muonium ($\mu^+\mu^-$). To leverage potential experimental signals, precise theoretical calculations are required. I will present the on-going work to compute higher-order corrections to the hyperfine splitting and the Lamb shift. Further, possible detection in rare meson decay experiments like REDTOP and using true muonium production to constrain mesonic form factors will be discussed.

The presence of exotic states of matter in neutron stars (NS) is currently an open problem in physics: the appearance of muons, kaons, hyperons and other exotic particles is thought to happen in the inner regions of the NS due to energetic considerations and is considered as an effective mechanism to soften the equation of state (EoS) [1, 2]. In the so-called two-families scenario [3, 4], in which NS co-exist with quark stars, NS can be very compact and have a maximum mass of about 1.5−1.6M⊙, while quark stars can have large radii and be even more massive, up to 2.75 M⊙. The increasing softening of the EoS allows to reach very small radii for the star that becomes unstable and converts into a quark star. The process of conversion of a NS into a quark star proceeds in two phases: a first rapid burning followed by a much slower combustion. During this second phase, material can be ablated by neutrinos from the surface of the star. This is particularly interesting, since it opens the possibility of ejecting in the atmosphere not only neutron-rich nuclei, but also more exotic material such as hypernuclei. In this way, the atmosphere of a quark star could be radically different from the atmosphere of a NS. This offers a chance to distinguish between these two types of compact stars, providing a relevant feature that can be tested in observations and thus deserves to be investigated theoretically. In the NS atmosphere and surface traditional atoms from hydrogen to iron exist and their atomic spectra are observed, but also exotic atoms like (p µ−) or (Σ+ e−) could be present and in this talk we propose to investigate this topic. In particular, the spectroscopy of exotic atoms, made in the simplest case by two Fermions like (p µ−) or (Σ+ e−), can be inferred by the results obtained for hydrogen or hydrogen-like atoms in the extremely high magnetic field B of the NS, possibly exceeding 10^9 T. It is expected that, at these remarkably high magnetic fields, atoms are of cylindrical shape and that the traditional level structure observed in terrestrial experiments (gross, fine, hyperfine) is superseded by a much simpler structure (Landau levels) with only two quantum numbers: m that describes the radial excitations and ν that quantizes the motion along B. The analytical expressions of the wave functions and eigenvalues of these levels have been calculated at present only for hydrogen and in this original work we extend the existing solutions and parametrizations to the exotic atoms (p µ−) or (Σ+ e−), making some predictions on possible transitions that could be detected in the spectra of NS. References [1] Glendenning, N. K., Compact stars: Nuclear physics, particle physics and general relativity, Springer Science & Business Media, 2012. [2] Haensel, P., Potekhin, A. Y., Yakovlev, D. G., Neutron stars 1: Equation of state and structure, Springer Science & Business Media, 2007. [3] Drago, A., Lavagno, A., Pagliara, G., Pigato, D., The scenario of two families of compact stars. Part 1. Equations of state, mass-radius relations and binary systems, European Physical Journal A, 52, 40., 2016. [4] Drago, A., Pagliara, G., The scenario of two families of compact stars. Part 2: Transition from hadronic to quark matter and explosive phenomena, European Physical Journal A, 52, 41., 2016.

The electric quadrupole E2 spectrum of the hydrogen molecular ion H2+ is considered in details. The dependence on the laser polarization and the sensitivity to external magnetic fields is thoroughly studied with full account of the hyperfine structure of the molecular ion.

If the Nature was utterly symmetric the matter would not exist. Yet, processes driven by the gravitational, electromagnetic and strong interactions seem to be symmetric with respect to reflection in space (P), reversal in time (T) and charge conjugation (C). So far violations of these symmetries were observed only in processes governed by the weak interaction. Interestingly, though the matter which we know is made of quarks and leptons, violation of CP and T symmetries have been observed only for systems including quarks, and it has not yet been discovered in any processes involving purely leptonic matter. Positronium is the lightest purely leptonic object decaying into photons. As an atom bound by a central potential, it is a parity eigenstate, and as an atom built out of an electron and an anti-electron, it is an eigenstate of the charge conjugation operator. Therefore, the positronium is a unique laboratory to study discrete symmetries whose precision is limited, in principle, by the effects due to the weak interactions expected at the level of 10^−14 and photon–photon interactions expected at the level of 10^−9. The newly constructed Jagiellonian Positron Emission Tomograph (J-PET) enables to perform tests of discrete symmetries in the leptonic sector via the determination of the expectation values of the discrete-symmetries-odd operators, which may be constructed from the spin of ortho-positronium atom and the momenta and polarization vectors of photons originating from its annihilation. We will present the potential of the J-PET detector to test the C, CP, T and CPT symmetries in the decays of positronium atoms and report on results from the first data-taking campaigns. J-PET built of plastic scintillators, provides superior time resolution, high granularity, low pile-ups, and opportunity of determining photon’s polarization. These features allow us to expect a significant improvement in tests of discrete symmetries in decays of positronium atom (a purely leptonic system). J-PET: P. Moskal et al., Acta Phys. Polon. B47 (2016) 509. J-PET: A. Gajos et al., Nucl. Instrum. Meth. A819 (2016) 54. J-PET: D. Kamińska et al., Eur. Phys. J. C76 (2016) 445. J-PET: P. Moskal et al., Phys. Med. Biol. 61 (2016) 2025. J-PET: P. Moskal et al., Nucl. Instrum. Meth. A775 (2015) 54. J-PET: P. Moskal et al., Nucl. Instrum. Meth. A764 (2014) 317. J-PET: J. Smyrski et al., Nucl. Instrum. Meth. A851 (2017) 39.

The next generation experiments with muons and muonium atoms require muon beams with low energy, small transverse size and high intensity. At the Paul Scherrer Institute we are developing a novel device that reduces the phase space of a standard \mu^{+} beam by a factor of 10^{10} with 10^{-3} efficiency. The phase space compression is achieved by stopping \mu^{+} in cryogenic helium gas and applying strong electric and magnetic fields and gas density gradients. The beamline consists of several consecutive stages. The compression has already been demonstrated for each stage individually. The measurements show that we can achieve a muon beam compression with a high efficiency within few microseconds, as predicted by the simulations. In the next step, we will merge the various stages and extract the compressed muon beam from the gas into the vacuum. This work is supported by SNF grant 200020_172639.

The McMaster Intense Positron Beam Facility (MIPBF) is a new research reactor based e+ source for atomic physics and materials science. In this prelimary operation, decay gamma’s from the reactor core are incident on a platinum foil in vacuum. Pair production provides electrons and positron in the foil which also acts as a moderator, thermalizing many of the e+ to low energy. Such thermal positrons are ejected from the foil and are accelerated away from the core with an applied electric potential of ~10V. These low energy e+ as well as a much larger number of higher energy, unmoderated positrons are guided using magnetic fields out of the pool and external biological shielding block for experiments. Positrons passing through an aperture are incident on a target and annihilate into back-to-back gamma photons for coincident detection in NaI (Ti) scintillation crystal detectors. Varying electric potentials and magnetic fields throughout the 5 meter path allows study of the e+ beam properties. In this initial test, a moderated positron beam energy width of <10eV is measured in a cm radius beam, well suited for the buffer gas accumulator that has been assembled for this facility. In addition to these low energy particles we observe a 10 times higher rate of unmoderated e+ with energies near 100keV. This secondary beam may be remoderated to enhance the low energy e+ for trapping. It is also well suited for defect studies of surfaces or in bulk matter for materials science, also a part of this user facility. Initial estimates of this source scaled to full reactor activity indicate that the design rate of ~109 moderated e+/second should be achievable with an additional more intense component at higher energies.

An exotic system consisting of an antikaon and three nucleons will be considered. A search of a quasi-bound state in the system will be performed using four-body Faddeev-type equations. Different antiKN potentials will be used for studying dependence of the results on the two-body input.

This contribution deals with our recent study of antiproton-nucleus quasi bound states [1] using the latest version of the Paris $\bar{N}N$ potential [2]. We construct the pbar-nucleus optical potential based on the related S- and P-wave scattering amplitudes. The free amplitudes are modified by multiple scattering approach in order to account for Pauli correlations in the medium [3]. We discuss the energy dependence of the optical potential and evaluate the corresponding $\bar{p}$ binding energies and widths in selected nuclei by solving the Dirac equation. The S-wave Paris potential yields similar spectra of $\bar{p}$ bound states as the phenomenological potential accounting for $\bar{p}$ atom data [4], but larger $\bar{p}$ widths. Next, we discuss the effect of the P-wave interaction and the implications for the antiproton-nucleus quasi-bound states. References: [1] J. Hrtankova, J. Mares, Proceedings of 12th International Conference on Low Energy Antiproton Physics (LEAP 2016), JPS Conference Proceedings, in print. [2] B. El-Bennich, M. Lacombe, B. Loiseau and S. Wycech, Phys. Rev. C 79 (2009) 054001. [3] T. Wass, M. Rho and W. Weise, Nucl. Phys. A 617 (1997) 449. [4] J. Hrtankova, J. Mares, Nucl. Phys. A 945 (2016) 197.

The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms, in which one electron is replaced by a negatively charged kaon, is a unique tool to provide precise information on this interaction; the energy shift and the broadening of the low-lying states of such atoms, induced by the kaon-nucleus hadronic interaction, can be determined with high precision from the atomic X-ray spectroscopy, and this experimental method provides unique information to understand the low energy kaon-nucleus interaction at the production threshold. The lightest atomic systems, like the kaonic hydrogen and the kaonic deuterium deliver, in a model-independent way, the isospin-dependent kaon-nucleon scattering lengths. The most precise kaonic hydrogen measurement to-date, together with an exploratory measurement of kaonic deuterium, were carried out in 2009 at the DAFNE collider, by the SIDDHARTA collaboration at the electron-positron collider DAFNE of LNF-INFN, combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and very precise X ray detectors, like the Silicon Drift Detectors. The SIDDHARTA result triggered new theoretical work, which achieved major progress in the understanding of the low-energy strong interaction with strangeness reflected by the antikaon-nucleon scattering lengths calculated with the antikaon-proton amplitudes constrained by the SIDDHARTA data. The most important open question is the experimental determination of the hadronic energy shift and width of kaonic deuterium; presently, a major upgrade of the setup, SIDDHARTA-2, is being realized to reach this goal. In this talk, the SIDDHARTA-2 experiment, together with the most recent experimental results and the future projects of X-ray spectroscopy of light kaonic atoms are presented.

The HEATES collaboration aims to pioneer the next-generation high-resolution x-ray spectroscopy of hadronic atoms. We use a novel cryogenic x-ray spectrometer: an array of superconducting transition-edge-sensor (TES) microcalorimeters, offering unprecedented full-width-at-half-maximum energy resolution of 2 - 3 eV at 6 keV. The 240 pixel spectrometer array will have a large collecting area of about 20 mm^2 thanks to recent technological advances in multiplexed readout of TES multi-pixel arrays [1]. This will open a new door to investigate kaon-nucleus strong interactions. A kaonic atom is a Coulomb-bound system formed by a kaon, electrons, and a nucleus. Effects of the strong interaction between the kaon and atomic nucleus are experimentally extracted from characteristic x-ray-emission spectra of the most tightly bound energy levels that are the most perturbed by the strong force (e.g., [2-4] are recent measurements). Therefore, many experiments have collected data on a variety of targets [5]; however, the energy resolution of the conventional semiconductor spectrometers employed in these experiments is insufficient to see the small spectral effects due to the strong interaction. As a result, the depth of the K^- - nucleus potential at zero energy remains unknown. This is closely related to the investigation of bound states of the kaon to the nucleus and is one of the greatest problems today in strangeness nuclear physics [6]. Aiming to provide a breakthrough, we will measure the 3d-2p x-rays of kaonic helium-3 and helium-4 (6.2 keV and 6.4 keV, respectively) using arrays of the TES microcalorimeters, and determine the strong-force shifts in those 2p levels with a precision of 0.2 eV to distinguish between the two leading antikaon-nucleus strong-interaction models, J-PARC E62 [7]. We have conducted a pathfinding experiment by measuring pionic-atom x rays with a 240-pixel TES array at the Paul Scherrer Institut (PSI), and successfully demonstrated the feasibility of TES-based exotic-atom x-ray spectroscopy in a hadron-beam environment [8,9]. Recently we performed an experiment at the actual kaon beamline of J-PARC (K1.8BR) as a commissioning run. Kaon stop tuning and TES detector commissioning have been performed [10]. In this presentation we will give an overview of this project and present preliminary results of experiments at PSI and J-PARC. [1] J.N. Ullom et al., Synchrotron Radiation News 27 (2014) 24. [2] S. Okada et al., Phys. Lett. B 653 (2007) 387-391. [3] SIDDHARTA collaboration, Phys. Lett. B 697 (2011) 199-202. [4] SIDDHARTA collaboration, Phys. Lett. B 704 (2011) 113-117. [5] C.J. Batty, E. Friedman, A. Gal, Phys. Rep. 287 (1997) 385-445. [6] A. Gal, Nucl. Phys. A 914 (2013) 270-279. [7] https://j-parc.jp/researcher/Hadron/en/pac_1507/pdf/P62_2015-6.pdf [8] S. Okada et al., Prog. Theor. Exp. Phys. (2016) 091D01. [9] H. Tatsuno et al., J Low Temp Phys, 184 (2016) 930-937. [10] T. Hashimoto et al., IEEE Transactions on Applied Superconductivity, 27, 4 (2017) 1-5.

The production and properties of open and hidden strange hadrons ($K^+$, $K^-$ and $\phi$) in cold nuclear matter generated in pion-nucleus reactions ($\pi^- + A$, $A = C, W$) at $p_{\pi^-}= 1.7$~GeV/c has been investigated with the HADES setup (SIS18/GSI).\\ Exploring the modification of the (anti-)kaon spectral function in nuclear matter which should be already apparent at finite baryon densities is of particular interest. While, for the kaon ($K^+, K^0$) the repulsive $KN$-potential has been studied to some extent having a moderate strength ($20-40$~MeV), the existing data on in-medium effects of the antikaon produced off nuclear targets are very scare. Moreover, the $K^-$ can be absorbed in nuclear medium which should be driven by strangeness exchange processes on one ($K^- N\rightarrow Y\pi$) or more nucleons ($K^- NN\rightarrow YN\pi$). On the contrary, $K^+$ is not affected by strong absorption processes and can be treated as a quasi particle within nuclear matter, providing stringent constraints on the production mechanism of strange hadrons. In this context, also the $\phi$ production and absorption ($\phi\rightarrow K^+ K^-$, $BR \sim 48.9$\%) off light and heavy nuclear targets is studied.\\ In this talk, we are presenting evidence of the $K^-$ absorption on the basis of the $K^-/K^+$ ratios in both nuclear environments (C, W). In addition, the $\phi$ absorption in a nuclear medium is discussed by comparing the production off carbon and tungsten as well as the $K^-$ production in terms of the $\phi$ feed-down. \newline \newline * supported by the DFG cluster of excellence "Origin and Structure of the Universe" and SFB 1258

In this talk, the derivation of a KbarN-piSigma coupled-channels potential from chiral SU(3) dynamics will be presented. Recently, precise experimental data of the energy shift of kaonic hydrogen have been obtained by SIDDHARTA. Thanks to these data, the uncertainty of the KbarN scattering amplitude has been significantly reduced below the KbarN threshold, which leads to the quantitative description of the Lambda(1405) and the subthreshold KbarN interaction. For the application to the few-body kaonic nuclei, we previously established a potential construction method based on chiral SU(3) dynamics, respecting the properties of the scattering amplitude in the complex energy plane, and derived a KbarN signle-channel effective potential that incorporates the piSigma channel. Extending this method to include the piSigma channel explicitly, we now proceed to construct a KbarN-piSigma coupled-channels potential, motivated by the fact that dynamical effects of the piSigma channel are expected to be particularly important in the energy region around the piSigma threshold. This potential reveals new aspects of the Lambda (1405) and will be useful for reliable predictions of kaonic nuclei.

The strength of the kaon-antikaon interaction is crucial in the discussion on the nature of the scalar resonances a0(980) and f0(980), in particular for their interpretation as a K+K- molecules. So far, one of the few possibilities to study this interaction was the kaon pair production in multi-particle exit channels, e.g. like pp->ppK+K−. In this talk we present results of the K+K− interaction studies performed based on near threshold data gathered in proton-proton collisions at the Cooler Synchrotron COSY. We discuss also feasibility study of the $K+K-$ scattering length measurements at e+e− colliders.

The onset of Eta(548) binding in nuclei is explored in stochastic variational method (SVM) few-body calculations within a pionless effective field theory (EFT) approach at leading order, using regulated NN and NNN contact terms and a regulated energy-dependent Eta-N contact term derived from coupled-channel models of the N*(1535) nucleon resonance. A self consistency procedure is applied to deal with the energy dependence of the Eta-N subthreshold input, resulting in a weak dependence of the calculated Eta-nuclear binding energies on the EFT regulator. It is found [1] that the onset of binding Eta-3He requires a minimal value of the real part of the Eta-N scattering length close to 1 fm, yielding then a few MeV Eta binding in Eta-4He. The onset of binding Eta-4He requires a lower value which, however, exceeds 0.7 fm. Similar conclusions hold when the nuclear core dynamics is generated by using semi-realistic NN interactions [2]. [1] N. Barnea, B. Bazak, E. Friedman, A. Gal, arXiv:1703.02861. [2] N. Barnea, B. Bazak, E. Friedman, A. Gal, in preparation.

We report the precision spectroscopy of the pionic 121, 116Sn atom using the 122, 117Sn(d, 3He) reaction near the charged pion emission threshold.  　An established approach for quantitative evaluation of the chiral symmetry breaking in finite density is study of pion-nucleus interaction through the experimental measurement of pionic atoms. So far the 1s pionic states in 205Pb and 115, 119, 123Sn have been discovered at GSI. The deduced chiral order parameter was compared with that of the vacuum, which was deduced from the pionic hydrogen, and partial chiral restoration was suggested. However, the evaluation still had large systematic and statistical errors. 　For the further study of the symmetry breaking in medium, we measured the excitation energy of the 122, 117Sn(d, 3He) reaction at RIKEN, RI Beam Factory. The experiments were performed in 2010, as a pilot experiment, and 2014, for the precision measurement. In these experiments, we observed the distinct structures corresponding to the pionic bound states in 1s, 2p and other shallower states. At the pilot experiment, we succeed in measurement of the angular dependence of the pionic atom production reaction for the first time. In 2014, we improved the missing mass resolution and succeed in the precise determination of the binding energy of 1s and 2p pionic states simultaneously, which contribute to reduce the systematic errors dramatically. In the report, we will give the current status of the analysis.

The existence of eta-mesic nuclei in which the eta meson is bound in a nucleus by means of the strong interaction was postulated already in 1986 but it has not been yet confirmed experimentally. The discovery of this new kind of an exotic nuclear matter would be very important as it might allow for a better understanding of the h meson structure and its interaction with nucleons. The search for eta-mesic helium is carried out with high statistics and high acceptance with the WASA detector, installed at the COSY accelerator in the Research Center Juelich. The search is conducted via the measurement of the excitation function for selected decay channels of the 4He-h and 3He-h systems. The talk will include description of the experimental method used at WASA and the status of the data analysis.

A calculation of the electromagentic transition form factors between ground-state octet and decuplet baryons as well as the octet-only $\Sigma^0$ to $\Lambda$ transition is presented in the combined framework of of Dyson-Schwinger equations and covariant Bethe-Salpeter equations. Emphasis is put in the similarities among the different transitions as well as in the differences induced by $SU(3)$ flavour symmetry breaking.

The ASACUSA collaboration at CERNs Antiproton Decelerator aims to measure the ground-state hyperfine splitting of antihydrogen using a spec- troscopy method as a means to test CPT symmetry. The Rabi-type setup consists of an antiproton accumulator, a positron source, and a mixing trap functioning as antihydrogen source and a spectroscopy apparatus made out of a microwave cavity and a superconduction sextupole magnet, terminating in a tracking detector [1]. In previous beamtimes, this detector was made up out of a central BGO crystal and two layers of scintillating bars parallel to the beam direction [2][3]. This setup allowed measurements of the point of annihilation and the energy deposited as well as the angle of escaping π-mesons. Moreover, as the bars are read out on both sides a coarse position resolution in beam direction was also achieveable using timing information. For 2017s beamtime the detector was modified to allow a more precise spatial resolution in the beam direction by incorporating two additional layers of scintillating fibers perpendicular to the existing scintillating bars. The additional layers provide a spatial resolution in the order of millimeter which allows for an efficient discrimination of cosmic background as well as advanced tracking of the products of annihilation reactions. This contri- bution covers the design and construction of this upgrade to ASACUSAs detector as well as the results of preliminary performance studies. [1] E. Widmann et al. “Measurement of the hyperfine structure of antihy- drogen in a beam”. In: (Jan. 2013). arXiv: 1301.4670v1. url: http: //arxiv.org/abs/1301.4670v1 (cit. on p. 1). [2] Y. Nagata et al. “The development of the antihydrogen beam detec- tor and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy”. In: Journal of Physics: Conference Series 635.2 (2015), p. 022061. url: http://stacks.iop.org/1742-6596/635/i=2/a= 022061 (cit. on p. 1). [3] C. Sauerzopf et al. “Annihilation detector for an in-beam spectroscopy apparatus to measure the ground state hyperfine splitting of antihy- drogen”. In: (June 2016). url: http://www.sciencedirect.com/ science/article/pii/S0168900216305630 (cit. on p. 1).

The AEgIS Collaboration at CERN will perform the world’s first direct measurement of the Earth´s gravitational acceleration on antimatter, by sending an antihydrogen beam through a classical deflectometer. I will present a detector for a first measurement of the gravitational effects on an antimatter system. The detector consists of pure Caesium Iodide crystals and commercially available Silicon Photomultipliers to measure the light produced in the corresponding annihilation processes. The CsI crystals decay times and spectra were characterized using a Na²² source at room and at low temperatures. Furthermore the behaviour of the SiPMs at low temperatures was examined. A measurement at the GRACE line using antiprotons is planned for August.

The measurement of kaonic deuterium atoms provides an ideal setting to gather information about the strong interaction of particles with strangeness at low energy. In the E57 experiment at J-PARC and with SIDDHARTA-2 at DAΦNE the shift and width of the K-d 1s state will be determined by using newly developed Silicon Drift Detectors (SDDs) as a high precision x-ray detector. For both experimental setups the detector consists of 48 SDD arrays in different arrangements, which will measure the emitted X-rays of the kaons when cascading from an excited state to the ground state. The E57 set-up uses amplifier boards, developed at the SMI, including a digital logic part to provide a single gate output for 8 SDD channels. Furthermore, the cable length between SDDs and amplifier boards has to be longer than one metre, which made the development of a line-driver unit necessary. First test measurements, simulating the final E57 set-up, with a Fe-55 source were performed for SDD temperatures below 170K. The achieved results, fulfilling all the necessary requirements, will be shown.

Through precision spectroscopy on Ba+ ions we determine precisely the 6s2S1/2 - 6p2P1/2, 6p2P1/2 - 5d2D3/2, 6s2S1/2 - 5d2D3/2 transition frequencies. In these experiments we employ laser-cooled single trapped ions. The optical frequencies are controlled by a frequency comb and I2 line locked laser system. We have achieved more than 2 orders of magnitude improved values, i.e. we have reached 10−11 relative accuracy. In a further measurement we have determined precisely the lifetime of the lifetime of the 5d2D5/2 state. Our experiment is aimed at precisely testing the available atomic calculations and in particular atomic wave functions the knowledge of which is needed for interpreting a precise measurement of atomic parity violation in heavy alkaline earth atoms through light shifts in the narrow optical 6s2S1/2-5d2D3/2 single photon transition. The weak mixing angle can be determined precisely from the weak interaction contributions between primarily the nuclear neutrons and the atomic valence electron to the atomic binding.

Colliding beams of heavy ions at energies per nucleon in the range 10^2 - 10^4 GeV, corresponding to experiments RHIC at Brookhaven, and LHC at CERN, suggested that intense electromagnetic fields of these ions can produce relatively large fluxes of electron and heavy lepton pairs. The bound-free pair production (BFPP) is one of the processes that restrict the luminosity of the ion beams. In this process, the charge of the ion decreases and it is depleted out of the beam. For this reason, the calculation of the exact bound-free electron-positron pair production cross section is important for deciding the stability of the beam. Another important application of this calculation is for producing anti-hydrogen. Anti-hydrogen is the simplest bound state of antimatter and may be produced with the collision of anti-protons with ions. They were first produced and observed at CERN Low Energy Antiproton Ring (LEAR) in 1995. In this process (anti(p)+Z -> anti(H)+e(-)+Z), Xenon(Z=54) has been used. This process was first proposed by Munger et al. and they studied for the calculation of antihydrogen production cross section by the equivalent photon approximation (EPA). The cross section calculation of antihydrogen production is important, because as being BFPP, antihydrogen production mechanism also leads to a beam loss. In this work, we have calculated the BFPP and relativistic antihydrogen production with Monte Carlo integration techniques by computing the Feynman diagrams. The calculation shows that for large energies and charges, the antihydogen production cross section is quite large.

To explore the quantum collision dynamics of the stored molecular ions by the merging experiments with a beam of the neutral atoms, we are developing a new technique of mass spectroscopy for the neutral molecular fragments from the collisions using an array of superconducting transition-edge-sensor (TES) microcalorimeters at a brand-new cryogenic electrostatic ion storage ring in RIKEN (Wako, Japan). In the cosmic space, more than 100 kinds of various molecules exist despite low temperature and low density which is disadvantageous environment to the molecule formations. It remains still unknown how to be generated even for the simple molecules. We have recently developed a cryogenic low-temperature ion storage ring to reproduce such chemical reactions at a temperature of outer space. A molecular ion beam with a vibration-rotation energy (temperature) of ~4 Kelvin is stored in this storage ring; and we conduct experiments by an interflow collision with neutral molecular beam having the same direction and velocity as the stored ion beam, where low-energy collisions at the center-of-mass system are realized. It is important to identify the products by measuring those molecule masses after the collision to study the reaction mechanism. In the case of neutral fragments, however, it is difficult to apply the ordinary mass spectrometry without ionization for the neutral fragments. In our storage ring, the neutral products after the collision have almost the same velocity as initial ions / neutral molecules; thus mass identification can be realized by a measurement of the translational energy. However, the energy resolution of Micro Channel Plate (MCP) detector commonly utilized so far is not enough to identify the mass of molecular fragments. We aim a direct detection of neutral molecules and molecular fragments (less than 15 keV) generated after the chemical reactions reproduced using an array of TES microcalorimeters developed by NIST. By a measurement of the kinetic energy, we perform the mass spectrometric identification of those neutral fragments and aim comprehensive understanding of the chemical reactions from the initial to final stages. TES is operated at the superconducting critical temperature of less than 100 mK; thus we usually install radiation shields in front of the TES sensors to avoid infrared background from heat radiation which deteriorates the energy resolution. Unlike x-rays, the low energy molecules (~10 keV) easily stop at the radiation shields even for 100-nm-thick aluminum sheet; thus we need to remove the radiation shield window. One of key issue towards this TES application is how to operate TES system against the radiation background although our storage ring is at 4 K. We just started the study at RIKEN from this spring. In this presentation we will give an overview of this project and the recent progress.

The PANDA experiment, currently under construction at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, addresses fundamental questions in hadron and nuclear physics via interactions of antiprotons with a proton or nuclei, e.g. light and charm exotics, multi-strange baryons and hadrons in nuclei. It will be installed at the High Energy Storage Ring (HESR), which will provide an antiproton beam with a momentum range of 1.5 – 15 GeV/c and enables an high average interaction rate on the fixed target of 2 × 10 7 events/s. The PANDA experiment adopts a triggerless, continuous data acquisition. The data rate without any suppression will be in the order of 200 GB/s. With an online software-based data selection system a data reduction of a factor 100 – 1000 has to be achieved. This demands a highly advanced online analysis due to the high interaction rate which has to deal also with overlapping event data. Scalability and parallelization of the reconstruction algorithms are therefore a particular focus in the development process. A simulation framework called PandaRoot is used to develop and evaluate different reconstruction algorithms for event building, tracking and particle identification as well as further optimization of the detector performance. In a novel approach PandaRoot is able to run time-based simulations which allows to simulate the continuous data stream and the mixing of events in addition to the standard event-based simulation. It utilizes the common software framework for the future FAIR experiments, FairRoot, which is based on ROOT and Virtual MonteCarlo with Geant3 and Geant4. This contribution will give an overview about PandaRoot, the requirements on the event reconstruction algorithms and present the status of a reconstruction and tracking algorithm currently under development.

Two new experimental capabilities developed at LANL, the unprecedented ultracold neutron (UCN) source intensity and a highly accurate imaging UCN spectroscopy [1, 2], open door to precision UCN physics including quantum physics. UCNs provide one of the most sensitive probes for quantum physics and fluctuations since neutrons carry no electric charge and have already shown energy sensitivity approaching 10-14 eV or 0.01 peV at micron length scales, a regime inaccessible by using charged particles (limited by Coulomb interaction) or even ultracold atoms (due to electric dipole or Van der Waals interaction). By scattering UCNs off nanostructures (the wavelength of a typical UCN is around 100 nm), we can look for signatures of quantum coherence such as angular-dependent interference fringes and intensity correlations between two detectors, similar to the Hanbury-Brown & Twiss effect for photons. Another goal of the project is to investigate the feasibility of a source of coherent UCNs. Some preliminary theoretical results will also be given. References: [1] Z. Wang, M. A. Hoffbauer, C. L. Morris, N. B. Callahan, et al, ‘A Multilayer Surface Detector for Ultracold Neutrons.’ Nucl. Instrum. Meth Phys. Res. A 798, (2015) 30-35. [2] W. Wei, L. J. Broussard, et al., ‘Position-sensitive detection of ultracold neutrons with an imaging camera and its implications to spectroscopy.’ Nucl. Instrum. Meth Phys. Res. A 830, (2016) 36-43.

A brief overview of the recent progress in the research program of the FAMU collaboration is presented, with particular emphasize on the development of a mathematical model of the multi-pass optical cavity, needed for the optimization of the experimental set-up for the measurement of the hyperfine splitting in the ground state of the muonic hydrogen atom by laser spectroscopy methods. The specificity of the model is related to the fact that a pulsed laser and a pulsed muon source will be used in the experiment that makes the time distribution of the laser energy in the cavity as important as the spatial distribution. The preliminary analysis shows that the optimized parameters of a cavity with realistic characteristics will guarantee the required efficiency of the experimental method.

World data for elastic $\Lambda-p$ scattering over a wide range of relative momenta are quite scarce and only available for small beam momenta with an overall statistics of less then 200. The situation for $\pi^-$-induced reactions is even more limited. In order to improve the theoretical description, new constraints are necessary to parametrise the cross sections. In this context a dedicated $\pi^-$ + A (A = C, W) experimental campaign was performed at $p_\pi = 1.7$ $GeV/c$ with the HADES detector (SIS18/GSI). The $\Lambda$ yield has been studied and further on the $\Lambda - p$ correlation is investigated. For the reconstruction of the $\Lambda$ in the inclusive spectra the charged decay channel ($\Lambda \rightarrow p \pi^-$, BR = 63.9\%) is examined. After topological cuts, an integrated yield of ~11k $\Lambda$ has been extracted with a purity of 93\% ($\pi^- + W$). The data is corrected for limited efficiency and acceptance and extrapolated to uncovered phase space by using a Boltzmann distribution. For the study of the $\Lambda - p$ correlation it is necessary to know all kinematic variables of the $\Lambda$ before the scattering, which are reconstructed with the incoming beam and the outgoing $K^0$. Thus, events with a matching charge pattern ($\Lambda \rightarrow \pi^- p, K^0 \rightarrow \pi^+ \pi^-, p$) are selected. Based on a likelihood-method the particle species is determined considering the specific energy-loss in the MDCs and velocity $\beta$. Since the selected pattern contains two $\pi^-$ and p in the final state, an event hypothesis is applied to assign their corresponding mother particle. The best combination is selected by a simultaneous matching of the invariant mass to the nominal value within the detector resolution. This procedure leads to an extraction of $\sim$6k events in the $\pi^- + W$ system. \newline Shown on the poster is the extracted $\Lambda$ yield, aside with the preliminary $\Lambda - p$ correlation. * supported by the DFG cluster of excellence "Origin and Structure of the Universe" and BMBF 05P15WOFCA

Results from non-perturbative QCD indicate that chiral symmetry may be restored in the hot and dense matter produced in relativistic heavy ion collisions. This restoration would affect the vector meson mass spectrum and could be examined with the ALICE detector at the LHC. One of the most promising probes to study these effects are dileptons (mu+mu- and e+e-) from rho meson decays since they reach the detector without significant final state interactions. In order to precisely measure the low-mass dielectron spectrum a high purity sample of e+e- pairs will be required. Whilst traditional cut based methods can provide high purity samples, they suffer from low efficiency. Multivariate particle identification could in future be used to alleviate this drawback. The main background in the analysis of dielectrons are combinatoric e+e- pairs (S/B ~ 10-3 for 0.3 < Mee < 1 GeV/c2). This background contribution can be suppressed by rejecting e+ and e- tracks that originate from photon conversion processes. Numerous observables allow to discriminate background from signal dielectrons which motivates a multivariate approach in the classification of e+e- pairs. The employed machine learning methods and performance based on Monte-Carlo data will be presented as well as their application in the analysis of LHC Run 2 data.

We present the physics program of a high-luminosity low-energy $e^+e^-$ collider, which project is developed in BINP (Novosibirsk). The collider center-of-mass energy varies from 210 MeV up to 960 MeV. The physics program includes observaion and study of the $\mu^+mu^-$ bound state, dimuonium, measurement of effects of the final state interaction in the reactions $e^+e^-\to \mu^+mu^-$ and $e^+e^-\to \pi^+pi^-$ near thresholds, precise measurement of hadronic cross sections ($e^+e^-\to \pi^+pi^-$, $\pi^+pi^-\pi0$, $\pi^0\gamma$ etc.), study of rare processes, in particular, observation of direct production of the pseudoscalar mesons $\eta$ and $\eta^\prime$.

We consider the electromagnetic production of positron in collision of slow heavy nuclei, with the simultaneously produced electron captured by one of the nuclei. The cross-section of the discussed process exceeds essentially the cross-section of e^+ e^- production.

We present the results of non-singlet QCD analysis of xF3(x,Q2) structure function in NLO and NNLO which are performed based on charged current (CC) neutrino-nucleon deep inelastic scattering (DIS). In this analysis we extract the valence quark parton distributions xuv(x,Q2) and xdv(x,Q2) in a wide range of x and Q2, and determine their parameterization in two different scenarios with the correlated errors using xFitter package. We determine the strong coupling of Undefined control sequence alphs up to NNLO and perform a comparison with other determinations of Undefined control sequence alphs in deeply inelastic scattering. Our results for valence quark distributions and the strong coupling constant at NLO and NNLO are compatible with the available theoretical models.

It is shown that in the previous calculations of $K^0_{S}$ regeneration the noncoupled equations of motion have been considered instead of coupled one. We present the calculations based on the exact solution of coupled equations of motion and perturbation theory. The results differ radically from the previous ones.

An antihydrogen atom for a precise spectroscopy and a free-fall experiment is prepared in a high vacuum (~1 pPa) in a low temperature (down to a few Kelvin) and may annihilate with impurity particles: hydrogen atoms/ions, electrons and other gas atoms. Precise data of collision processes are required in the forthcoming experiments. The collision process of the antihydrogen atom and a hydrogen atom has been a fundamental and challenging problem for both theoretical and experimental studies. The reaction process is completely different from that of two hydrogen atoms. In the former collision, rearrangement of four particles occurs; namely, a protonium (Pn) and positronium (Ps) formation channel opens. The Pn would be in highly excited states due to energy matching between the initial and final states. The Pn deexcites to lower energetic states giving excess energy to Ps. The motion of the nuclei strongly affects the lepton motions. However, many works have adopted adiabatic methods in which the motions of nuclei and light particles are separately calculated in this collision process. In this work, we perform a non-adiabatic calculation of the resonance states near the cold collision energy between the antihydrogen atom and the hydrogen atom/ion. Oscillation Gaussian basis sets are introduced to reproduce the highly excited Pn wavefunctions up to n=30 with an accuracy of 6-digit. Near the cold collision threshold, resonance energies and widths are obtained by a complex rotation method. To reveal the resonance mechanism, proton mass dependence of resonance parameters is examined and compared with adiabatic calculations. The resonance states near the collision energy show a deviation from the adiabatic vibrational states and the widths are independent of the initial channel. It indicates that the resonance states couple with the rearrangement channels which breaks the adiabatic picture. The resonance widths are found to be broader than that of Boltzmann distribution of the experimental condition. Thus, the resonance phenomena are expected to be a good indication of temperature of an ultra cold atomic gas and to be utilized to purge the impurity particles by changing the temperature.

The Pauli Exclusion Principle (PEP) is the foundation for our understanding of physics where systems of fermions are concerned. Therefore, it is important to make precision tests of the PEP. In a pioneering experiment, Ramberg and Snow supplied an electric current to a Cu target, and searched for PEP violating atomic transitions of the “fresh" electrons from the current. The non-existence of the anomalous X-rays from such transitions then set the upper limit for a PEP violation. The VIP2 (VIolation of Pauli Exclusion Principle) experiment improves this method. The experiment and the preliminary results from the first data taking period in the underground laboratory of Gran Sasso (LNGS) will be presented.

We present a new method of spectroscopy, utilizing a drift effect to disperse charged particles in a uniformly curved magnetic field. The curved field results in a drift of the charged particles perpendicular to the radius of the curvature and to the magnetic field, which is proportional to the particle’s momentum. A spatial-resolving detector will determine the momentum spectra. The first realization, called NoMoS (Neutron decay prOducts MOmentum Spectrometer), will measure correlation coefficients in free neutron beta decay to test the Standard Model of particle physics and to search for physics beyond. Currently, the focus is on the design and the construction of the magnet system.

One of the key aspects in antimatter research is the detection and tagging of antiprotons and antihydrogen, which is usually achieved via tracking of the annihilation products while the annihilation occurs somewhere else, e.g. on the walls of the traps. We hereby report on a novel approach of a so-called direct detection of antiprotons, in which they annihilate within the detector volume and which has the potential of sensibly improving the resolution on the position determination. The R&D effort was made within the AEgIS experiment at CERN that aims to study antimatter gravity, i.e. to directly measure the free fall of antihydrogen with a precision of the order of few percent. The design of the experiment requires detection of antihydrogen annihilations with a resolution on the position of the order of 10 um. The development of a position sensitive detector that would measure the vertical shift of the antihydrogen atoms influenced by the Earth\u2019s gravity included evaluation of different detector technologies for direct antiproton annihilation. The first tests and measurements were performed in 2012, using monolithic active pixel and 3D sensors within the main AEgIS apparatus. The promising results lead to the development and construction of a dedicated facility for detector studies, GRACE, which is operational since 2015. This beam line makes use of the secondary branch of the existing antiproton beam line at the Antiproton Decelerator, which it shares with the AEgIS experiment . GRACE exploits simple beam optics and an electrostatic deflector to provide antiprotons with very low energy (1-8 keV). Over the last two years GRACE has been employed to study the performance of the Timepix3 as a direct annihilation detector. The Timepix3 is an ASIC developed within the Medipix3 collaboration at CERN, characterized by an extremely high spatial resolution and accurate TOA (time-of-arrival) and TOT (time-over-threshold) information. For our application, the Timepix3 chip was coupled to a particularly thick (675 um) silicon sensor, allowing a much-improved tracking length. These characteristics make it ideal to tag the typical signature of antiproton annihilation, where several charged products depart from the annihilation point, with typical energies of hundreds of MeV, creating a signature star-shaped event. Some of the results on the performance of GRACE as well as a detailed study of the Timepix3 capabilities as an annihilation detector will be presented.

Torsion is a geometrical characteristic of a curved spacetime, which is additional to a metric tensor. In the standard form of the Eistein-Cartan gravitational theory it is shown that the contribution of torsion to the Einstein equations can be interpreted in terms of the torsion energy-momentum tensor. A requirement of its local conservation in a curved spacetime with an arbitrary metric or an arbitrary gravitational field demands a proportionality of the torsion energy-momentum tensor to a metrictensor, a covariant derivative of which vanishes because of the metricity condition. This fulfill a requirement of local conservation. The coefficient of proportionality can be identified with the cosmological constant. This allows to claim that torsion can serve as a geometrical origin i) for vacuum energy density, given by cosmological constant or dark energy density in the Universe, and ii) for Big Bang because of its negative pressure. This is a model-independent result, which is also valid in the Poincaré gauge gravitational theory by Kibble (T. W. B. Kibble, J. of Math. Phys., 2, 212 (1961)). In terrestrial laboratories torsion can be probed through torsion-fermion low-energy interactions.

The $p\bar{p}$ invariant mass spectra of the processes $J/\psi\to p\bar{p}\pi^0$, $J/\psi\to p\bar{p}\eta$, $J/\psi\to p\bar{p}\omega$, $J/\psi\to p\bar{p}\rho$, and $J/\psi\to p\bar{p}\gamma$ close to the $p\bar{p}$ threshold are calculated by means of the $N\bar{N}$ optical potential. The simple potential model for $N\bar{N}$ interaction in the $^{1}S_{0}$ and $^{3}S_{1}$ states is proposed. The parameters of the model are obtained by fitting the cross sections of $N\bar{N}$ scattering together with the cross sections of $N\bar{N}$ production in $e^+e^-$ annihilation and the $p\bar{p}$ invariant mass spectra of the $J/\psi$ decays. Good agreement with the available experimental data is achieved. Using our potential and the Green's function approach we also describe the peak in the $\eta'\pi^{+}\pi^{-}$ invariant mass spectrum in the decay $J/\psi\to\gamma\eta'\pi^{+}\pi^{-}$ in the energy region near the $N\bar{N}$ threshold.

Coherent reactions, when the hypernucleus is produced in a fixed quantum state, are especially sensitive to the reaction mechanism and to the properties of the hyperon-nucleus interaction. Exclusive hypernuclear production reactions by antiproton annihilation on a nuclear target populating single-Lambda states plab = 1.5...20 GeV/c are discussed in a Glauber model approach [1,2]. Initial and final state interactions are considered. Available elastic antiproton-nucleus data are well described. The elementary production amplitude of the underlying proton-antiproton to hyperon-antihyperon process includes 𝑡-channel exchange by the pseudoscalar K, vector K*(860), and the yet to be confirmed scalar kappa(800) S=+/-1 mesons. The relativistic wave functions of the bound proton and Λ are calculated from the static Dirac equation with scalar and vector potentials describing properly the binding energy and r.m.s. nucleon radii of the initial nucleus and the phenomenological energy levels of the final hypernucleus. The inclusion of the kappa meson strongly influences the beam momentum dependence of the hypernucleus production cross sections in various quantum states [2]. This can be regarded as the first clear signal of the correlated pion-Kaon exchange in antiproton-nucleus collisions. [1] A. Larionov, H. Lenske, Nucl.Phys. A957 (2017) 450. [21] A. Larionov, H. Lenske, PLB (in print), arXiv:1703.02073

Tomography and gravitational radii for hadrons by three-dimensional structure functions S. Kumano, Qin-Tao Song, and O. V. Teryaev Hadron tomography can be investigated by three-dimensional structure functions such as generalized parton distributions (GPDs), transverse-momentum-dependent parton distribution (TMDs), and generalized distribution amplitudes (GDAs). The GPDs and GDAs contain information on spacelike and timelike transverse form factors of the energy-momentum tensor, so that they probe gravitational-interaction radii of hadrons [1]. Although charge radii of the nucleons are determined, mass radii have not been measured for any hadrons. Here, we extract the GDAs, which are s-t crossed quantities of the GPDs, from cross-section measurements of hadron-pair production process gamma+gamma^* to h+hbar [1]. The GDAs are expressed by a number of parameters and they are determined from pion-pair production data of KEKB. We discuss the dependence on parton-momentum fraction z in the GDAs and also time-like form factor of the energy-momentum tensor [1]. Our studies should be valuable for probing three-dimensional structure of hadrons, especially for applications to exotic hadron candidates which cannot be used as fixed targets for GPD and TMD measurements [2]. In addition, the results indicate the gravitational-interaction radius for the pion [1]. The GDA studies are also possible by the two-photon process into a hadron pair by ultra-peripheral collisions at LHC and RHIC. In future, there is a possibility to investigate the GPDs at J-PARC for nucleon tomography [3]. [1] S. Kumano, Qin-Tao Song, and O. V. Teryaev, KEK-TH-1959, J-PARC-TH-0086, to be submitted for publication. [2] S. Kumano and H. Kawamura, Phys.Rev. D89 (2014) 054007. [3] S. Kumano, M. Strikman, and K. Sudoh, Phys. Rev. D80 (2009) 074003; T. Sawada, Wen-Chen Chang, S. Kumano, Jen-Chieh Peng, S. Sawada, and K. Tanaka, Phys. Rev. D 93 (2016) 114034.

We report on our very recent self-consistent calculations of $K^-$-nuclear quasi-bound states [1]. Relevant $K^-$ optical potentials were developed within several chiral meson-baryon coupled-channel interaction models [2-5]. The applied models yield quite different $K^-$ binding energies and widths [6]. Then, the $K^-$ multinucleon interactions were incorporated by a phenomenological optical potential introduced recently to achieve good fits to kaonic atom data [7]. Our calculations show that the effect of $K^-$ multinucleon interactions on $K^-$ widths in nuclei is decisive. The resulting widths are considerably larger than corresponding binding energies. Moreover, when the density dependence of the $K^-$ multinucleon interactions derived in the fits of kaonic atoms is extended to the nuclear interior, the only two models acceptable after imposing as additional constraint the single-nucleon fraction of $K^-$ absorption at rest do not yield any kaonic nuclear bound state in majority of considered nuclei. [1] J. Hrtankova, J. Mares, Phys. Lett. B in print, arXiv:1703.01788v2 [nucl-th]. [2] A. Cieply, J. Smejkal, Nucl. Phys. A 881 (2012) 115. [3] Y. Ikeda, T. Hyodo, W. Weise, Nucl. Phys. A 881 (2012) 98. [4] Z. H. Guo, J. A. Oller, Phys. Rev. C 87 (2013) 035202. [5] M. Mai, U.-G. Meissner, Nucl. Phys. A 900 (2013) 51. [6] J. Hrtankova, J. Mares, subm. Phys. Rev. C, arXiv:1704.07205 [nucl-th]. [7] E. Friedman, A. Gal, Nucl. Phys. A 959 (2017) 66.

The paper discusses a low energy е+е- collider for production of the (mumu-) bound system (dimuonium) which has not yet been observed. We use large crossing angle for e+e- beams intersection; therefore, dimuonium carries non-zero momentum and its decay point is shifted from the beam collision area providing effective suppression of the elastic e+e- scattering background. Discussion of the experiment constraints defines subsequent collider specifications. We show preliminary layout of the accelerator and obtained main parameters. Chosen beam energy range and high luminosity also allow to study pi+pi- and eta-mesons.

The first major assembly stage of the barrel part of the electromagnetic calorimeter of the PANDA experiment at the future FAIR facility by assembling one single barrel slice segment will be presented. The calorimeter is composed of two endcaps and a barrel covering the major part of the solid angle consisting of more than 11.300 tapered PbWO4 crystals. Each scintillator module is readout via two large area avalanche photo diodes connected to custom made ASIC-preamplifier. The construction of the first segment comprises a full length slice beam holding in total 18 module blocks. Each block consists of a matrix of 4x10 crystals. The assembly procedure of single detector modules, module blocks and the overall slice segment, respectively will be discussed. Test results of single components and fully assembled detector modules will be discussed and compared with earlier prototype in-beam and lab tests. Supported by BMBF, GSI and HIC for FAIR.

The modern approach to meson-baryon interactions at low energies is based on coupled-channels techniques with inter-channels couplings derived from an effective chiral Lagrangian. These interactions lead to emergence of dynamically generated resonances that are assigned to experimentally observed hadronic states with the $\Lambda(1405)$ and $N^{*}(1535)$ being the most prominent ones in the strangeness sectors S=-1 and S=0, respectivelly. The resonances are related to the poles of the transition matrix with the pole positions identified as solutions of the equation that sets to zero the determinant of the inverse of the T-matrix. In our study we use models presented in Refs. [1] and [2] to analyze the conditions for an emergence of such poles in the $\bar{K}N$ and $\eta N$ s-wave amplitudes. Additional insights are obtained by investigating movement of the poles to the zero coupling limit in which the inter-channels couplings are switched off. In particular, different concepts of forming the $\Lambda(1405)$ resonance were revealed and constraints related to the appearance of such poles were discussed in [3] where a comparative analysis of various approaches to the $\bar{K}N$ interactions was presented as well. Our analysis also indicates a possible existence of a subthreshold isovector $\bar{K}N$ resonance. [1] A. Cieply and J. Smejkal, Nucl. Phys. A881 (2012) 115. [2] A. Cieply and J. Smejkal, Nucl. Phys. A919 (2013) 46. [3] A. Cieply, M. Mai, U.-G. Meissner and J. Smejkal, Nucl. Phys. A954 (2016) 17.

A direct measurement of the gravitational acceleration of antimatter has the potential to show that we live in a “Dirac-Milne” Universe, which could explain cosmological observations without the need for dark matter, dark energy, inflation, or missing antimatter. Such a measurement would also be sensitive to the possible existence of a fifth force. Cooling antimatter to temperatures where gravitational energies are comparable to thermal energies is challenging for most forms of antimatter, which annihilate upon contact with matter. The exception is the antimuon (μ+), which is easily cooled by stopping in cold matter, but the short muon lifetime poses challenges. Positive muons that stop in material will combine with free electrons to form muonium, a neutral leptonic atom with most of its mass derived from the 2nd-generation antimuon. We are developing the Muonium Antimatter Gravity Experiment (MAGE) to measure the gravitational force on muonium using a novel, monoenergetic, low-velocity, horizontal muonium beam directed at an ultra-precise atom interferometer. If successful, MAGE will measure for the first time the gravitational coupling to a 2nd-generation particle in a system whose antimatter-dominated mass is not predominantly strong-interaction binding energy. The novel MAGE beam production approach could also have important applications to other muonium experiments as well as to the measurement of g-2.

We perform Dalitz plot analyses of $J/\psi$ three-body hadronic decays to $\pi^+ \pi^-\pi^0$, $K^+ K^-\pi^0$ and $K^0_S K^{\pm} \pi^{\mp}$ using the isobar and Veneziano models. The $J/\psi$ is produced through the Inital-State-Radiation process. We also perform Dalitz plot analyses of $\eta_c$ three-body hadronic decays to $K^+ K^-\pi^0$ and $K^0_S K^{\pm} \pi^{\mp}$, where the $\eta_c$ is produced in two-photon interactions. An isobar model is used, as well as a Model Independent Partial Wave Analysis which allows to extract the amplitude and phase of the $K \pi$ S-wave up to a mass of 2.5 GeV.

Recent model-independent measurements of the absolute branching ratio of the normalisation mode Lambda_c -> p^+ K^- pi^+ by the Belle1 and BES32 collaborations have significantly increased the precision of previously measured decay channels. BES3 also independently updated the value for the Sigma^+ pi^- pi^+ mode, however the branching fraction into the Sigma^0 pi^0 pi^+ decay channel has not been improved upon since the measurement by the CLEO3 collaboration. We report new measurements of the branching fractions of the decays Lambda^+_c -> Sigma^+ pi^- pi^+, Sigma^0 pi^0 pi^+ and Sigma^+ pi^0 pi^0 based on 711/fb of integrated luminosity recorded with the Belle detector at the KEKB asymmetric energy e^+e^- collider near the Upsilon(4S) resonance (charge conjugated decays are implicitly included). All results are obtained relative to Lambda_c -> p^+ K^- pi^+. This is the first measurement of the Lambda^+_c -> Sigma^+ pi^0 pi^0 channel. The measurements of the other modes are significantly more precise compared to previous analyses and of similar precision to the recent BES3 results. 1 A. Heller et al. (Belle Collaboration) Phys. Rev. D 91, 112009 (2014) 2 M. Ablikim et al. (BESIII Collaboration) Phys. Rev. Lett. 116, 052001 (2015) 3 P. Avery et al. (CLEO Collaboration) Physics Letters B, Volume 325, Issue 1 (1994)

The Belle II experiment, being constructed at the KEK laboratory in Japan, is a substantial upgrade of both the Belle detector and the KEKB accelerator. It aims at collecting 50 times more data than existing B-Factory samples beginning in 2019. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now number in the dozens, and represent the emergence of a new category within quantum chromodynamics. This talk will present the capabilities of Belle II to explore exotic and conventional bottomonium physics. There will be a particular focus on the physics reach of the first data, where opportunities exist to make an immediate impact in this area.

We introduce the use of the Weibull distribution as a simple parametrization of charged particle multiplicities in hadron-hadron collisions at all available energies, ranging from ISR energies to the most recent LHC energies. In statistics, the Weibull distribution has wide applicability in natural processes that involve fragmentation processes. This provides a natural connection to the available state-of-the-art models for multiparticle production in hadron-hadron collisions, which involve QCD parton fragmentation and hadronization. The Weibull distribution describes the multiplicity data at the most recent LHC energies better than the single negative binomial distribution. The study has been extended to leptonic collisions and heavy ion collisions. The Weibull regularity successfully describes the higher order multiplicity moments in both hadronic and leptonic collisons. The Weibull regularity, which reproduces the multiplicity distributionsalong with the genuine correlations, seems to be the optimal model to describe the multiparticle production process.

The Large Hadron Collider (LHC) has delivered at the end of 2015 Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. This data sample from the so-called LHC Run 2, complements the Run 1 datasets of Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. These datasets allow for a systematic study of the light (anti-)(hyper-)nuclei production in ultra relativistic heavy ion collisions. Thanks to its excellent particle identification and tracking capabilities, the ALICE detector allows for the identification of light nuclei and the corresponding anti-nuclei in a wide momentum range. Moreover, by means of the Inner Tracking System's capability to separate primary from secondary vertices, it is possible to identify (anti-)hypertritons exploiting the two (\hyp~$\rightarrow$~\he~+~\pim) and three body (\hyp~$\rightarrow$~d~+~p~+~\pim) mesonic weak decays. The study of (anti-)hypertriton production at both energies will be discussed and findings will be compared to model predictions. Results on the measurement of (anti-)hypertriton production yields in Pb--Pb collisions along with the hypertriton lifetime will be shown. Plans for the future LHC Run 3, scheduled to start in 2021, with the expected improvements in the statistics and precision will be also presented.

We report measurements of the differential cross sections and polarizations of B hadron and quarkonium states. These are important tools to investigate heavy-quark production mechanisms in QCD. The dependences on transverse momentum, rapidity, and particle multiplicity are investigated. Comparisons with theory expectations and among different collision energies are provided.

The large sample of high quality data taken in pp collisions at $\sqrt{s} = 7$ TeV and 13 TeV and in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV at the LHC with the ALICE detector allows for a systematic study of the light (anti-)nuclei production in these collision systems. The excellent performance of the Inner Tracking System, the Time Projection Chamber and the Time-Of-Flight detector provide a clear identification and separation of primary produced light (anti-)nuclei from secondaries. Additionally, the high energy deposit of Z=2 particles in the Transition Radiation Detector has been exploited to collect a hardware-triggered data sample in the high-interaction rate p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. First findings from this (anti-)nuclei enriched sample will be shown. New results on (anti-)deuteron production as a function of multiplicity in pp and p-Pb collisions will be presented, as well as the measurement of (anti-)helium-3 in p-Pb collisions. The goal is to study production mechanisms such as coalescence in small systems, and to compare them to those in heavy-ion collisions. Finally, perspectives will be given for studies with the increased statistics from the LHC Run II.

We present precise measurements of decay properties of hadrons containing a b quark performed on the data collected by the CMS experiment at LHC. The lifetime is among the fundamental properties of particles and in heavy hadrons it is one of the important observables that allows to test the theoretical tools describing their physics. Some of the reported measurements are at the precision level of the world average for these properties.

The measurement of the mass-to-charge ratio difference between nuclei and anti-nuclei probes the possibility of subtle differences between the way protons and neutrons bind together in nuclei compared with how their respective anti-particles form anti-nuclei. Such a study provides a quantitative verification of the matter/anti-matter symmetry in the context of the nuclear forces, a remnant of the underlying strong interaction between quarks and gluons. Relativistic heavy ion collisions at the CERN Large Hadron Collider (LHC) provide a copious source of matter and anti-matter particles. They create suitable conditions for producing light nuclei and anti-nuclei with nearly identical abundances. Thanks to its excellent tracking and particle identification capabilities, the ALICE experiment allows the investigation of these produced (anti-)matter states at LHC. The experiment makes accurate measurement of the curvature of particle tracks in the detector's magnetic field and of the particles' time of flight, and this information is used to determine the mass-to-charge ratio mu = m/z for nuclei and anti-nuclei. The precision comparison of the deuteron and anti-deuteron, and the 3He and 3Hebar nuclei mass-to-charge ratio will be presented. The precision of the measurement of the relative differences Δmu_ddbar/mu_d = [0.9 ± 0.5 (stat.) ± 1.4 (syst.)] x 10^-4 and Δmu_3He3Hebar/mu_3He = [-1.2 ± 0.9 (stat.) ± 1.0 (syst.)] x 10^-3 improves by one to two orders of magnitude with respect to analogous results obtained more than 40 years ago. Combining these results with existing measurements of the masses of the anti-nucleons, the relative binding energy differences are extracted, Δe_ddbar/e_d = -0.04 ± 0.05 (stat.) ± 0.12 (syst.) and Δe_3He3Hebar/e_3He = 0.24 ± 0.16(stat.) ± 0.18 (syst.). These results test, to an unprecedented precision, the CPT invariance in the sector of light (anti-)nuclei. Interestingly, these results are obtained in a high energy physics experiment at LHC designed for other purposes. Perspectives of improved limits with a future larger data set will be also discussed.

The high energy densities reached at LHC lead to the production of a significant amount of light hypernuclei as well as (anti-)nuclei which are consequently observed in several collision systems, namely from proton-proton (pp), to proton-lead (p-Pb) up to lead-lead (Pb-Pb) collisions. Several potentially existing exotic QCD bound states, such as the H- dibaryon, could be produced and they feature many similarities to known hyper- and anti- nuclei. The excellent particle identification performance of the ALICE experiment allows for the possible detection of these rarely produced particles. The presence of the Inner Tracking System detector close to the interaction point, enables the primary produced particles to be distinguished from the ones coming from other sources such as weak decays. In this contribution, the expected production rates for exotic states based on the latest ALICE measurements of (anti-)nuclei and hyper-nuclei and their comparison to theoretical model predictions will be discussed first. Then the estimated upper limits for the Λn and H-dibaryon exotic bound state production will be presented. Finally the expected improvements in such measurements with the increased statistics and performance in the next LHC Run periods will be discussed.