Speaker
Description
We have developed a microscopic model for the $K^-NN$ absorption in nuclear matter [1]. The absorption was described as a meson-exchange process and the primary $K^-N$ interaction strength was derived from the state-of-the-art chiral models. The medium modifications of the $K^-N$ scattering amplitudes due to the Pauli principle were taken into account. The model was applied in calculations of kaonic atoms for the first time [2]. The description of the data significantly improved when the two nucleon absorption was considered. The branching ratios for various $K^-$ absorption channels in $^{12}$C$ + K^-$ atom were calculated and compared with old bubble chamber data, as well as with the latest data from the AMADEUS collaboration [3]. Next, we considered the hadron ($Y, K^-, \pi$) selfenergies in the $K^-N$ scattering amplitudes as well as in the $K^-NN$ absorption model. Their effect on the total $K^-$ potential in nuclear matter is currently being explored.
References:
[1] J. Hrtankova, A. Ramos, Phys. Rev. C 101 (2020) 035204.
[2] J. Obertova, E. Friedman, J. Mares, Phys. Rev. C 106 (2022) 065201.
[3] R. Del. Grande et al., Eur. Phys. J. C 79 (2019) 190.