Analysis of spectral modification of $ϕ$ mesons at finite density using a transport approach in the 12 GeV pA reactions
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914292535656448 |
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| author | PS E325 Collaboration Ichikawa, Masaya Gubler, Philipp Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki 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 | PS E325 Collaboration Ichikawa, Masaya Gubler, Philipp Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki 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 | The hadron spectrum at finite density is an important observable for exploring the origin of hadron masses. In the KEK-PS E325 experiment, the di-electron decays of phi mesons inside and outside nuclei were measured using 12 GeV pA reactions. In the previous analysis, a significant excess was observed on the low-mass side of the phi meson peak in the data for slow-moving phi mesons ($βγ=p_ϕ/m_ϕ<1.25$) with the Cu target, and in-medium vector meson spectral modification was verified. We newly employed the PHSD transport approach to take into account the time evolution of spatial density distribution of the target nuclei. Consistent with the previous analysis, a significant excess was observed in the present analysis as well. It was found that incorporating momentum dependence into the spectral modification leads to better agreement with the experimental results. For the slow-moving $ϕ$ mesons with the Cu target, the newly obtained modification parameters are consistent with those from the previous analysis within the uncertainties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00420 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analysis of spectral modification of $ϕ$ mesons at finite density using a transport approach in the 12 GeV pA reactions PS E325 Collaboration Ichikawa, Masaya Gubler, Philipp Chiba, Junsei En'yo, Hideto Fukao, Yoshinori Funahashi, Haruhiko Hamagaki, Hideki Ieiri, Masaharu Ishino, Masaya Kanda, Hiroki 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 The hadron spectrum at finite density is an important observable for exploring the origin of hadron masses. In the KEK-PS E325 experiment, the di-electron decays of phi mesons inside and outside nuclei were measured using 12 GeV pA reactions. In the previous analysis, a significant excess was observed on the low-mass side of the phi meson peak in the data for slow-moving phi mesons ($βγ=p_ϕ/m_ϕ<1.25$) with the Cu target, and in-medium vector meson spectral modification was verified. We newly employed the PHSD transport approach to take into account the time evolution of spatial density distribution of the target nuclei. Consistent with the previous analysis, a significant excess was observed in the present analysis as well. It was found that incorporating momentum dependence into the spectral modification leads to better agreement with the experimental results. For the slow-moving $ϕ$ mesons with the Cu target, the newly obtained modification parameters are consistent with those from the previous analysis within the uncertainties. |
| title | Analysis of spectral modification of $ϕ$ mesons at finite density using a transport approach in the 12 GeV pA reactions |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2507.00420 |