2024/08/27 by Philipp Gubler, Gubler, Philipp, M. Ichikawa +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2408.15364
openalex publication_date 2024/08/27 · openalex created_date 2024/09/22 · openalex updated_date 2026/07/28
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 ρ0, we find visible modifications of the generated dilepton spectra for the in-medium scenarios compared to the vacuum distribution.