SIDDHARTA impact on KN $ar{K}N$ amplitudes used in in–medium applications

Abstract

We have performed new fits of our chirally motivated coupled–channels model for meson–baryon interactions and discussed the impact of the SIDDHARTA measurement on the K $ar{K}$ N amplitudes in the free space and in nuclear medium. The kaon–nucleon amplitudes generated by the model are fully consistent with our earlier studies that used the older kaonic hydrogen data by the DEAR collaboration. The subthreshold energy dependence of the in–medium K $ar{K}$ N amplitudes plays a crucial role in K $ar{K}$ –nuclear applications.