Velocity dependence of the mass modifications of $ρ$ and $ω$ mesons in 12 GeV $p+A$ reactions
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arXiv
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2025
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| author | Nakai, Wataru Aoki, Kazuya Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki Kanno, Koki Kitaguchi, Masaaki Mihara, Satoshi Miwa, Koji Miyashita, Takuya Murakami, Tetsuya Muto, Ryotaro Nakura, Terunao Naruki, Megumi Ozawa, Kyoichiro Sakuma, Fuminori Sasaki, Osamu Sekimoto, Michiko Tabaru, Tsuguchika Tanaka, Kazuhiro Togawa, Manabu Yamada, Satoru Yokkaichi, Satoshi Yoshimura, Yoshio |
| author_facet | Nakai, Wataru Aoki, Kazuya Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki Kanno, Koki Kitaguchi, Masaaki Mihara, Satoshi Miwa, Koji Miyashita, Takuya Murakami, Tetsuya Muto, Ryotaro Nakura, Terunao Naruki, Megumi Ozawa, Kyoichiro Sakuma, Fuminori Sasaki, Osamu Sekimoto, Michiko Tabaru, Tsuguchika Tanaka, Kazuhiro Togawa, Manabu Yamada, Satoru Yokkaichi, Satoshi Yoshimura, Yoshio |
| contents | This study measured the invariant mass spectra of $ρ$ and $ω$ mesons in the $e^+e^-$ decay channel for 12 GeV (12.9 GeV/$c$) $p+\mathrm{C}$ 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 $βγ$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18900 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Velocity dependence of the mass modifications of $ρ$ and $ω$ mesons in 12 GeV $p+A$ reactions Nakai, Wataru Aoki, Kazuya Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki Kanno, Koki Kitaguchi, Masaaki Mihara, Satoshi Miwa, Koji Miyashita, Takuya Murakami, Tetsuya Muto, Ryotaro Nakura, Terunao Naruki, Megumi Ozawa, Kyoichiro Sakuma, Fuminori Sasaki, Osamu Sekimoto, Michiko Tabaru, Tsuguchika Tanaka, Kazuhiro Togawa, Manabu Yamada, Satoru Yokkaichi, Satoshi Yoshimura, Yoshio Nuclear Experiment This study measured the invariant mass spectra of $ρ$ and $ω$ mesons in the $e^+e^-$ decay channel for 12 GeV (12.9 GeV/$c$) $p+\mathrm{C}$ 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 $βγ$ 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. |
| title | Velocity dependence of the mass modifications of $ρ$ and $ω$ mesons in 12 GeV $p+A$ reactions |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2507.18900 |