arXiv · 2507.18900
Velocity dependence of the mass modifications of $\rho$ and $\omega$ mesons in 12 GeV $p+A$ reactions
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 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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Wataru Nakai, Kazuya Aoki, Junsei Chiba, Hideto En'yo, Yoshinori Fukao, Haruhiko Funahashi, Hideki Hamagaki, Masaharu Ieiri, Masaya Ishino, Hiroki Kanda, Koki Kanno, Masaaki Kitaguchi, Satoshi Mihara, Koji Miwa, Takuya Miyashita, Tetsuya Murakami, Ryotaro Muto, Terunao Nakura, Megumi Naruki, Kyoichiro Ozawa, Fuminori Sakuma, Osamu Sasaki, Michiko Sekimoto, Tsuguchika Tabaru, Kazuhiro Tanaka, Manabu Togawa, Satoru Yamada, Satoshi Yokkaichi, Yoshio Yoshimura. 2025-07-25. Velocity dependence of the mass modifications of $\rho$ and $\omega$ mesons in 12 GeV $p+A$ reactions. https://doi.org/10.1093/ptep%2Fptaf104
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