Preprint

GSI-2024-01308

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Production and in-medium modification of $ϕ$ mesons in proton-nucleus reactions from a transport approach

Gubler, P. ; Ichikawa, M. ; Song, T.GSI* ; Bratkovskaya, E. (Corresponding author)GSI*

2024
arXiv

Please use a persistent id in citations: doi:10.48550/ARXIV.2408.15364

Abstract: Production and in-medium modification of hidden strange $ϕ$ mesons are studied in proton-nucleus reactions - p+C, p+Cu and p+Pb - at 12 GeV/c, partially measured by the KEK E325 collaboration via the dilepton decay mode. This work is based on the off-shell microscopic Parton-Hadron-String Dynamics (PHSD) transport approach, which provides the dynamical description of strongly interacting hadronic and partonic degrees of freedom in dense matter, and especially makes it possible to simulate in-medium off-shell dynamics of the $ϕ$ meson in the reactions studied. Different in-medium scenarios for the modification of the $ϕ$ meson spectral function in nuclear matter are investigated: i) dropping pole mass, ii) collisional broadening and iii) simultaneous dropping pole mass and collisional broadening. Even though the $ϕ$ meson production in p+A reactions occurs only at densities around or below normal nuclear matter density $ρ_0$, we find visible modifications of the generated dilepton spectra for the in-medium scenarios compared to the vacuum distribution.

Keyword(s): High Energy Physics - Phenomenology (hep-ph) ; High Energy Physics - Experiment (hep-ex) ; Nuclear Experiment (nucl-ex) ; Nuclear Theory (nucl-th) ; FOS: Physical sciences

---

Contributing Institute(s):

1. Heiße & Dichte QCD Materie (TES)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)

Experiment(s):

1. no experiment theory work (theory)

Appears in the scientific report 2024

---