5-9 September 2011
Austrian Academy of Sciences, Vienna
Europe/Vienna timezone
Thanks to all participants and have a good and safe trip home!

Energy dependence of KbarN interaction in nuclear medium

6 Sep 2011, 16:45
2h 5m
Aula (Austrian Academy of Sciences, Vienna)


Austrian Academy of Sciences, Vienna

Sonnenfelsgasse 19 1010 Vienna Austria
Poster Strangeness in Matter Poster Session


Dr Ales Cieply (Nuclear Physics Institute, Řež)


We have constructed effective separable meson-baryon potentials to match the equivalent chiral amplitudes with the parameters of the model fitted to the kaonic hydrogen and low energy $K^{-}p$ reactions data [1]. When the $\bar{K}N$ system is submerged in nuclear medium the $\bar{K}N$ scattering amplitude and the final state branching ratios exhibit a strong energy dependence when going to energies below the $\bar{K}N$ threshold [2]. The observed behavior is related to the dynamics of the well known $\Lambda(1405)$ resonance as well as to a combined effect of in-medium Pauli blocking and kaon selfenergy. A sharp increase of $\bar{K}N$ attraction below the $\bar{K}N$ threshold provides a link between shallow $\bar{K}$-nuclear potentials based on the chiral $\bar{K}N$ amplitude evaluated at threshold and the deep phenomenological optical potentials obtained in fits to kaonic atoms data. The energy and density dependence of the in-medium $R(K^{-}N \rightarrow \pi \Lambda)$ branching ratio has allowed us to explain the $A$-dependence of the $\Lambda$-hypernuclear production rates [3] measured by the FINUDA collaboration in the experiment with stopped kaons. Similarly, we demonstrate the impact of a subthreshold energy dependence of the in-medium $\bar{K}N$ amplitude on the characteristics of $\bar{K}$-nuclear states and on the construction of the $K^{-}$-nuclear optical potential used to describe the kaonic atoms data [2, 4]. [1] A.Cieply and J.Smejkal, Eur. Phys. J. A43 (2010) 191 [2] A.Cieply, E.Friedman, A.Gal, and D.Gazda, J.~Mares, ArXiv:1102.4515[nucl-th] [3] A.Cieply, E.Friedman, A.Gal and V.Krejcirik, Phys. Lett. B698 (2011) 226 [4] A.Cieply, E.Friedman, A.Gal, D.Gazda, and J.Mares, work in progress

Primary author

Dr Ales Cieply (Nuclear Physics Institute, Řež)

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