First measurement of $ϕ$ meson production in 30 GeV proton-nucleus reactions via di-electron decay at J-PARC
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918361410043904 |
|---|---|
| author | PARC E16 collaboration Nakasuga, Satomi Morino, Yuhei Aoki, Kazuya Aramaki, Yoki Arimizu, Daichi Ashikaga, Sakiko Chang, Wen-Chen Ejima, Ren En'yo, Hideto Garces, Dairon Rodriguez Heuser, Johann M. Honda, Ryotaro Ichikawa, Masaya Ishii, Daichi Kajikawa, Shunsuke Kakunaga, Jo Kanno, Koki Kawama, Daisuke Komatsu, Yusuke Kondo, Takehito Hori, Yusuke Murakami, Hikari Murakami, Tomoki Muto, Ryotaro Nagafusa, Shunnosuke Nakai, Wataru Naruki, Megumi Obara, Yuki Ochiai, Shuta Ogura, Makoto Ozawa, Kyoichiro Rodriguez, Adrian Rodriguez Sako, Hiroyuki Sato, Susumu Sekimoto, Michiko Shigaki, Kenta Suzuki, Kazuki Takahashi, Tomonori Taniguchi, Tomohiro Teklishyn, Maksym Toia, Alberica Yamada, Rento Yamaguchi, Kanako Yamaguchi, Yorito Yanai, Shogo Yokkaichi, Satoshi |
| author_facet | PARC E16 collaboration Nakasuga, Satomi Morino, Yuhei Aoki, Kazuya Aramaki, Yoki Arimizu, Daichi Ashikaga, Sakiko Chang, Wen-Chen Ejima, Ren En'yo, Hideto Garces, Dairon Rodriguez Heuser, Johann M. Honda, Ryotaro Ichikawa, Masaya Ishii, Daichi Kajikawa, Shunsuke Kakunaga, Jo Kanno, Koki Kawama, Daisuke Komatsu, Yusuke Kondo, Takehito Hori, Yusuke Murakami, Hikari Murakami, Tomoki Muto, Ryotaro Nagafusa, Shunnosuke Nakai, Wataru Naruki, Megumi Obara, Yuki Ochiai, Shuta Ogura, Makoto Ozawa, Kyoichiro Rodriguez, Adrian Rodriguez Sako, Hiroyuki Sato, Susumu Sekimoto, Michiko Shigaki, Kenta Suzuki, Kazuki Takahashi, Tomonori Taniguchi, Tomohiro Teklishyn, Maksym Toia, Alberica Yamada, Rento Yamaguchi, Kanako Yamaguchi, Yorito Yanai, Shogo Yokkaichi, Satoshi |
| contents | We present the first measurement of the production of the $ϕ$ meson in 30 GeV proton-nucleus interactions on carbon and copper targets via the di-electron decay channel. The measurement was conducted at the high-momentum beamline of the J-PARC Hadron Experimental Facility, which was commissioned in 2020. The $e^+e^-$ pairs were detected using the E16 spectrometer, during a commissioning run of the J-PARC E16 experiment. The $ϕ$ mesons are successfully reconstructed on all experimental targets. The obtained yields are converted to the total production cross section, assuming a kinematical distribution of the event generator JAM. The total cross sections derived are 2.0 $\pm$ 0.9 (stat.) $\pm$ 1.0 (syst.) mb on the carbon target and 10.3 $\pm$ 4.4 (stat.) $\pm$ 4.4 (syst.) mb on the copper target. The mass-number dependence of the cross section is discussed using the parameter $α$, defined as $σ\propto A^α$, resulting in $α= $ 0.99 $\pm$ 0.38 (stat.) $\pm$ 0.34 (syst.). The extrapolation to $A=1$, which means that the cross section of proton-proton reactions, is in good agreement with the existing measurements at comparable energies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_00403 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | First measurement of $ϕ$ meson production in 30 GeV proton-nucleus reactions via di-electron decay at J-PARC PARC E16 collaboration Nakasuga, Satomi Morino, Yuhei Aoki, Kazuya Aramaki, Yoki Arimizu, Daichi Ashikaga, Sakiko Chang, Wen-Chen Ejima, Ren En'yo, Hideto Garces, Dairon Rodriguez Heuser, Johann M. Honda, Ryotaro Ichikawa, Masaya Ishii, Daichi Kajikawa, Shunsuke Kakunaga, Jo Kanno, Koki Kawama, Daisuke Komatsu, Yusuke Kondo, Takehito Hori, Yusuke Murakami, Hikari Murakami, Tomoki Muto, Ryotaro Nagafusa, Shunnosuke Nakai, Wataru Naruki, Megumi Obara, Yuki Ochiai, Shuta Ogura, Makoto Ozawa, Kyoichiro Rodriguez, Adrian Rodriguez Sako, Hiroyuki Sato, Susumu Sekimoto, Michiko Shigaki, Kenta Suzuki, Kazuki Takahashi, Tomonori Taniguchi, Tomohiro Teklishyn, Maksym Toia, Alberica Yamada, Rento Yamaguchi, Kanako Yamaguchi, Yorito Yanai, Shogo Yokkaichi, Satoshi Nuclear Experiment We present the first measurement of the production of the $ϕ$ meson in 30 GeV proton-nucleus interactions on carbon and copper targets via the di-electron decay channel. The measurement was conducted at the high-momentum beamline of the J-PARC Hadron Experimental Facility, which was commissioned in 2020. The $e^+e^-$ pairs were detected using the E16 spectrometer, during a commissioning run of the J-PARC E16 experiment. The $ϕ$ mesons are successfully reconstructed on all experimental targets. The obtained yields are converted to the total production cross section, assuming a kinematical distribution of the event generator JAM. The total cross sections derived are 2.0 $\pm$ 0.9 (stat.) $\pm$ 1.0 (syst.) mb on the carbon target and 10.3 $\pm$ 4.4 (stat.) $\pm$ 4.4 (syst.) mb on the copper target. The mass-number dependence of the cross section is discussed using the parameter $α$, defined as $σ\propto A^α$, resulting in $α= $ 0.99 $\pm$ 0.38 (stat.) $\pm$ 0.34 (syst.). The extrapolation to $A=1$, which means that the cross section of proton-proton reactions, is in good agreement with the existing measurements at comparable energies. |
| title | First measurement of $ϕ$ meson production in 30 GeV proton-nucleus reactions via di-electron decay at J-PARC |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2603.00403 |