Velocity dependence of the mass modifications of ρ and ω mesons in 12 GeV p+A reactions

2025/07/25 by Nakai, Wataru, Aoki, Kazuya, Chiba, Junsei +26
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.2507.18900

Abstract

This study measured the invariant mass spectra of ρ and ω mesons in the e⁺e^- decay channel for 12 GeV (12.9 GeV/c) p+C and p+Cu reactions (√(s)_NN=5.1 GeV) at the KEK 12-GeV Proton Synchrotron. The measured spectra were divided into three βγ regions to examine their velocity dependence. Across all regions, significant excesses were observed on the low-mass side of the ω meson peak, beyond the contributions of known hadronic sources, in the data of the C and Cu targets. Model calculations were subsequently performed to evaluate the magnitudes of the mass modifications of ρ and ω mesons.

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