Experimental and theoretical status of and perspectives for XYZ states
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Europe/Berlin
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Zoom Meeting ID: 918 4422 7439
Frank Nerling
(GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI)),
Christoph Hanhart
(FZ Jülich)
Beschreibung
While a majority of the community agrees that the XYZ states have a non-q̄q nature, the internal structure of these states is not yet understood. To deepen our understanding in this field, additional experimental and theoretical studies are needed. For example, complete spin multiplets should be studied; to distinguish true resonance signals from kinematic effects, the confirmation of states in different experiments is needed; resonance shape measurements are compulsory to access the long ranged parts of the exotic wave functions.
At present most experimental information comes from Belle (II) (Japan), BESIII (China) and LHCb (CERN). The gluon-rich process of pp̄ annihilation as it will be available for the upcoming PANDA experiment at the FAIR facility (Germany) promises new and complementary insights. The workshop focusses on the status and future perspectives in the field of exotic hadrons in the heavy quarkonium mass region.
Confirmed invited speakers:
| Experiment | Talk (title) |
| Peter Braun-Munzinger | "ALICE results on XYZ" |
| Sean Dobbs | "Study charmonia and hybrids with GlueX" |
| Simon Eidelmann | "Future relevant experiments" |
| Alexey Guskov | "COMPASS results on XYZ states" |
| Zhiqing Liu | "BESIII results on X and Z states" |
| Roman Mizuk | "Belle(II) XYZ results in the B sector" |
| Sebastian Neubert | "LHCb results on exotic charmonia" |
| Marco Pappagallo | "LHCb results on (ordinary) charmonia and bottomonia" |
| Cheng-Ping Shen | "Belle(II) XYZ results in the charm sector" |
| Chengzeng Yuan | "BESIII results on vector Y states" |
| Theory | Talk (title) |
| Eric Braaten | "Production of X(3872)" |
| Nora Brambilla | "Effective field theories for regular quarkonia and exotics" |
| Feng-Kun Guo | "Triangle Singularities" |
| Luciano Maiani | "Tetraquarks" |
| Ulf-G. Meißner | "Hadronic Molecules" |
| Alessandro Pilloni | "Production of X(3872)" |
| Sinead Ryan | "Lattice QCD in the doubly heavy sector" |
| Marc Vanderhaegen | "Inclusion of pi pi interactions in heavy meson decays" |
Support Contact
Teilnehmer
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xyz: session 1
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1
OpeningSprecher: Frank Nerling (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
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2
BESIII results on vector Y statesSprecher: Changzheng Yuan (IHEP Beijing)
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3
BESIII results on X, Z statesSprecher: Zhiqing Liu (Shandong University)
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1
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10:25
Coffeebreak
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xyz: session 2
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4
Dissecting XYZ-states with functional methodsSprecher: Christian Fischer (JLU Giessen)
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5
Test of the nature of $P_{cs}(4459)$ as a hadronic molecule in the $\Xi_b^-\to J/\psi \Lambda K^-$ decaySprecher: Li-Sheng Geng (Beihang University)
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6
X(3872) in the hybrid model of charmonium and hadronic moleculeSprecher: Yasuhiro Yamaguchi (Japan Atomic Energy Agency)
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4
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12:00
Lunchbreak
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xyz: session 3
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7
Effective field theories for regular quarkonia and exoticsSprecher: Nora Brambilla (TUM)
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8
Hadronic MoleculesSprecher: Ulf-G. Meißner (Univ. Bonn/FZ Jülich)
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7
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15:20
Coffeebreak
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xyz: session 4
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9
Nonrelativistic effective field theories for exotic heavy hadronsSprecher: Jaume Tarrús (IFAE)
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10
Heavy fourquarks and dibaryon statesSprecher: Nilmani Mathur (Tata Institute of Fundamental Research)
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11
On history of the bottomonium-like states Z_b discovery (In Memoriam Misha Voloshin)Sprecher: Alex Bondar (Budker Institute, Novosibirsk )
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9
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xyz: session 5
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12
Belle(II) results in the charm sectorSprecher: Chengping Shen (Fudan University)
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13
Belle(II) XYZ results in the B sectorSprecher: Kirill Chilikin (Lebedev Physical Institute of the Russian Academy of Sciences)
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12
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10:20
Coffeebreak
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xyz: session 6
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14
Coupled-channel interpretation of the LHCb double-J/psi spectrumSprecher: Alexey Nefediev (Lebedev Physics Institute)
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15
X0(2900) in the molecular pictureSprecher: Qian Wang (South China Normal University)
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16
Production of 1++ states in e+e- collisionSprecher: Yuping Guo (Fudan University)
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14
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12:05
Lunchbreak
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xyz: session 7
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18
Production of X(3872)Sprecher: Alessandro Pilloni (INFN Roma)
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19
Production of X(3872)Sprecher: Eric Braaten (Ohio State Univerity)
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18
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15:20
Coffeebreak
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xyz: session 8
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20
Loosely bound states in relativistic nuclear collisions at the LHCSprecher: Peter Braun-Munzinger (EMMI/GSI )
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21
X(3872) and DDbar* interactions in a nuclear mediumSprecher: Miguel Albaladejo Serrano (JLAB)
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22
The properties and production of fully-heavy tetraquarks in a strongly interacting mediumSprecher: Jiaxing Zhao (Tsinghua University)
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20
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xyz: session 9
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23
LHCB results on charmoniaSprecher: Marco Pappagallo (Università e INFN Bari)
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24
LHCB results on exotic charmoniaSprecher: Sebastian Neubert (HISKP Uni Bonn)
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23
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10:20
Coffeebreak
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xyz: session 10
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25
Observation of the Zcs(3985) state at BESIIISprecher: Ying-Chao Xu (UCAS)
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26
Zcs exotics in B -> J/psi phi / K decays at LHCbSprecher: Zehua Xu (Peking University)
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27
Heavy fourquark states from lattice QCDSprecher: Sasa Prelovsek
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25
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11:55
Lunchbreak
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xyz: session 11
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28
Radiative a pionic transitions of Y(4320) and the new Z_sc(3982)Sprecher: Luciano Maiani (Universita' di Roma La Sapienza)
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29
Inclusion of pi pi interactions in heavy meson decaysSprecher: Igor Danilkin (JGU Mainz)
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28
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15:20
Coffeebreak
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xyz: session 12
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30
Insights on the Z_b(10610) and Z_b(10650) from the dipion decaysSprecher: Vadim Baru (Ruhr University Bochum)
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31
CMS results and prospects on XYZ statesSprecher: Ruslan Chistov (P.N.Lebedev Institute, Russian Academy of Sciences (LPI RAS))
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32
GlueX resultsSprecher: Sean Dobbs (Florida State University(FSU))
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30
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xyz: session 13
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33
Triangle singularities and new ideas about the X(3872)Sprecher: Feng-Kun Guo (Institute of Theoretical Physics, CAS)
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34
Importance of meson-meson and of diquark-antidiquark creation operators for a b-bar b-bar u d tetraquarkSprecher: Marc Wagner (Johann Wolfgang Goethe-Universität Frankfurt am Main)
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33
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10:20
Coffeebreak
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xyz: session 14
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35
Bottomonium resonances in the Born-Oppenheimer approximation using static potentials from lattice QCDSprecher: Lasse Mueller (Goethe University Frankfurt)
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36
Long ranged part of static potentialSprecher: Naeem Anwar (FZJ)
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37
Hybrid static potentials at small quark-antiquark separationsSprecher: Carolin Riehl (Goethe University Frankfurt)
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38
Workshop Photo - ScreenshotSprecher: Participants online
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35
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12:00
Lunchbreak
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xyz: session 15
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39
Lattice QCD in the doubly heavy sectorSprecher: Sinéad Ryan (Trinity College Dublin)
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40
Heavy-Light Tetraquarks with Lattice QCDSprecher: Martin Pflaumer (Goethe Universität Frankfurt)
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41
COMPASS results on XYZ statesSprecher: Alexey Guskov (Joint Institute for Nuclear Research)
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39
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15:30
Coffeebreak
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xyz: session 16
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42
Can We Resolve the Nature of χc1(3872) with PANDA?Sprecher: Klaus Götzen (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
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43
Future relevant experimentsSprecher: Simon Eidelman (Budker Institute, Novosibirsk and Lebedev Institute, Moscow)
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Closing of the workshopSprecher: Christoph Hanhart (FZ Jülich)
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42
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