Chirally motivated $\bar{K}N$ amplitudes for in-medium applications

Details Chirally motivated $\bar{K}N$ amplitudes for in-medium applications Chirally motivated $\bar{K}N$ amplitudes for in-medium applications

2011-12-05

arxiv.org/abs/1112.0917v2

Physics

Nuclear Physics

Nuclear Theory

18 pages, updated to match the version accepted for publication in a special issue of Nuclear Physics A on Strangeness Nuclear

Scientific paper

A new fit of a chirally motivated coupled-channels model for meson-baryon interactions is presented including the recent SIDDHARTA data on the 1s level characteristics of kaonic hydrogen. The kaon-nucleon amplitudes generated by the model are fully consistent with our earlier studies. We argue that a sharp increase of the real part of the in-medium $K^{-}p$ amplitude at subthreshold energies provides a link between the shallow $\bar{K}$-nuclear optical potentials obtained microscopically from threshold $\bar{K}N$ interactions and the phenomenological deep ones deduced from kaonic atoms data. The impact on the $A$-dependence of the $\Lambda$-hypernuclear formation rates measured in reactions with stopped kaons is discussed too.

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