Velocity Dependence of the Mass Modifications of ρ and ω Mesons in 12 GeV p + A Reactions

Le résumé fourni par la source

Abstract This study measured the invariant mass spectra of $\rho$ and $\omega$ mesons in the $e^+e^-$ decay channel for 12 GeV (12.9 GeV/$c$) $p+\mathrm{C}$ and $p+\mathrm{Cu}$ reactions ($\sqrt{s}_{NN}=5.1$ GeV) at the High Energy Accelerator Research Organization (KEK) 12-GeV Proton Synchrotron. The measured spectra were divided into three $\beta \gamma$ regions to examine their velocity dependence. Across all regions, significant excesses were observed on the low-mass side of the $\omega$ 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 $\rho$ and $\omega$ mesons.

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