Baryons 2022 - International Conference on the Structure of Baryons

Antikaon-nucleon interactions and the momentum correlation functions in high-energy collisions

Not scheduled

20m

Seville

Parallel contribution Hadron-hadron interactions

Speaker

Tetsuo Hyodo (Tokyo Metropolitan University)

Description

The strong interaction between an antikaon and a nucleon is at the origin of various interesting phenomena in kaon-nuclear systems [1]. In particular, the interaction in the isospin $I=0$ channel is sufficiently attractive to generate a quasi-bound state, the $\mathrm{\Lambda }(1405)$ resonance, below the $\overline{K}N$ threshold. Based on this picture, it may be expected that the $\overline{K}N$ interaction also generates quasi-bound states in kaon-nuclear systems, sometimes called kaonic nuclei. At the same time, the $\overline{K}N$ quasi-bound picture of the $\mathrm{\Lambda }(1405)$ is also related to the discussion of hadronic molecules in hadron spectroscopy.

Femtoscopic study of the two-particle momentum correlation functions in high-energy collisions has become a new method to extract the hadron-hadron interactions. We study the two-particle correlation function of a $K^{-}p$ pair from high-energy collisions in the $\overline{K}N$-$\pi \mathrm{\Sigma }$-$\pi \mathrm{\Lambda }$ coupled-channels framework [2]. The effects of all coupled channels together with the Coulomb potential and the threshold energy difference between $K^{-}p$ and ${\overline{K}}^{0}n$ are treated completely. Realistic potentials based on the chiral SU(3) dynamics are used which fit the available scattering data [3]. We discuss the resulting $K^{-}p$ correlation functions in comparison with the recent measurements by the ALICE collaboration with various collision conditions [4].

[1] T. Hyodo, W. Weise, arXiv:2202.06181 [nucl-th]
[2] Y. Kamiya, T. Hyodo, K. Morita, A. Ohnishi and W. Weise, Phys. Rev. Lett. 124 (2020) 132501.
[3] K. Miyahara, T. Hyodo, and W. Weise, Phys. Rev. C 98 (2018) 025201.
[4] S. Acharya et al. (ALICE collaboration), Phys. Rev. Lett. 124 (2020) 092301; S. Acharya et al. (ALICE collaboration), Phys. Lett. B 822 (2021) 136708, ALICE collaboration, arXiv:2205.15176 [nucl-ex]