Studying the phi meson in nuclear matter by simulating pA reactions in a transport approach
Philipp Gubler
日本原子力研究開発機構
日時：2021年02月18日（木） 13:00-
場所：オンライン
The phi meson is a hadron made of a strange and an anti-strange quark, which has the same quantum numbers as the photon. While its vacuum properties, such as mass and width, are well known, it is not clear how these properties will change once the phi is put in an extremely dense environment such as nuclear matter. To study how the phi meson behaves at finite density has been the goal of several recent and near future experiments at multiple facilities around the world [1-3]. Theoretically, many works have been conducted with the aim of studying the phi meson in nuclear matter. Connecting theoretical results with experimental measurements is, however, a non-trivial task, as the phi meson in nuclear matter is usually produced in relatively high-energy pA (p:proton, A: nucleus) reactions, which are generally a non-equilibrium processes. In this seminar I will report on an ongoing project [4], attempting to simulate pA reactions in which the phi meson is produced in nuclei at rest, making use of a transport approach [5]. First results of simulations of 12 GeV p+C and p+Cu reactions will be presented and comparisons between obtained dilepton spectra and experimental data of the E325 experiment at KEK [1] will be made.
[1] R. Muto et al., Phys. Rev. Lett. 98, 042501 (2007).
[2] A. Polyanskiy et al., Phys. Lett. B 695, 74 (2011).
[3] S. Ashikaga et al., (J-PARC E16 Collaboration), JPS Conf. Proc. 26, 024005 (2019).
[4] P. Gubler and E. Bratkovskaya, in progress.
[5] W. Cassing and E.L. Bratkovskaya, Nucl. Phys. A 831, 215 (2009).