Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC
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2026
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| author | Fusayasu, Takahiro Iizawa, Tomoya Ikeda, Fumihito Ishikawa, Akimasa Iwasaki, Masako Iwase, Hiroshi Kawahara, Takahiro Masaki, Aoi Miyahara, Fusashi Morikawa, Yu Okayasu, Yuichi Ono, Toshiyuki Otono, Hidetoshi Sakaki, Yasuhito Seino, Takumi Shimasaki, Yuta Suehara, Taikan Takubo, Yosuke Tsumura, Shusaku Uemura, Kosuke Zhang, Yifu |
| author_facet | Fusayasu, Takahiro Iizawa, Tomoya Ikeda, Fumihito Ishikawa, Akimasa Iwasaki, Masako Iwase, Hiroshi Kawahara, Takahiro Masaki, Aoi Miyahara, Fusashi Morikawa, Yu Okayasu, Yuichi Ono, Toshiyuki Otono, Hidetoshi Sakaki, Yasuhito Seino, Takumi Shimasaki, Yuta Suehara, Taikan Takubo, Yosuke Tsumura, Shusaku Uemura, Kosuke Zhang, Yifu |
| contents | We report the results of a search for sub-GeV axion-like particles (ALPs) using pilot run data from the Electron Beam-dump Experiment at KEK LINAC Switching Yard 3 (EBES). The data were collected in December 2023 with a 4 GeV positron beam and correspond to $1.3\times10^{14}$ positrons on target. In the pilot run setup, a tungsten beam dump and a single PbO calorimeter were used. We consider ALP production via the Primakoff process induced by bremsstrahlung photons in the beam dump, followed by the decay $a\toγγ$. The background was estimated with a data-driven method, and a signal region was defined such that the expected background yield is below 0.1 events. No events were observed after unblinding. Upper limits at the 90% confidence level were derived in the ALP mass-coupling plane, extending the experimental coverage into a region of parameter space not explored by previous searches. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_07108 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC Fusayasu, Takahiro Iizawa, Tomoya Ikeda, Fumihito Ishikawa, Akimasa Iwasaki, Masako Iwase, Hiroshi Kawahara, Takahiro Masaki, Aoi Miyahara, Fusashi Morikawa, Yu Okayasu, Yuichi Ono, Toshiyuki Otono, Hidetoshi Sakaki, Yasuhito Seino, Takumi Shimasaki, Yuta Suehara, Taikan Takubo, Yosuke Tsumura, Shusaku Uemura, Kosuke Zhang, Yifu High Energy Physics - Experiment High Energy Physics - Phenomenology We report the results of a search for sub-GeV axion-like particles (ALPs) using pilot run data from the Electron Beam-dump Experiment at KEK LINAC Switching Yard 3 (EBES). The data were collected in December 2023 with a 4 GeV positron beam and correspond to $1.3\times10^{14}$ positrons on target. In the pilot run setup, a tungsten beam dump and a single PbO calorimeter were used. We consider ALP production via the Primakoff process induced by bremsstrahlung photons in the beam dump, followed by the decay $a\toγγ$. The background was estimated with a data-driven method, and a signal region was defined such that the expected background yield is below 0.1 events. No events were observed after unblinding. Upper limits at the 90% confidence level were derived in the ALP mass-coupling plane, extending the experimental coverage into a region of parameter space not explored by previous searches. |
| title | Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC |
| topic | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.07108 |