Prospects for Pentaquark Baryon Search with the Upgraded LEPS2 Facility
We present prospects for the $\Theta^+$ pentaquark baryon search using the newly constructed LEPS2 facility at SPring-8. The LEPS2 detector system features significant improvements in acceptance for multi-particle final states compared to previous experiments. Our search employs two complementary strategies: direct production in the $\gamma n \to K^-\Theta^+$ reaction using a liquid deuterium target with a photon beam up to 2.4 GeV, and $\bar{K}^{*0}$-associated $\Theta^+$ production using a liquid hydrogen target with a photon beam up to 2.9 GeV. The extended acceptance covers both forward and large angle regions, effectively spanning the kinematic regions explored by previous LEPS and CLAS experiments. The large acceptance and improved resolution of LEPS2, combined with these complementary approaches, provide unprecedented sensitivity for establishing the existence of the $\Theta^+$ or placing definitive upper limits on its production.
Authors
- T. Hotta (ORCID: https://orcid.org/0000-0002-1079-5826)
- Hiroaki Ohnishi (ORCID: https://orcid.org/0000-0001-9427-1984)
- Yoji Ohashi (ORCID: https://orcid.org/0000-0001-9930-495X)
- A. Higashi
- H. Ohkuma
- T. Ishikawa (ORCID: https://orcid.org/0000-0002-4471-1547)
- M. Yosoi (ORCID: https://orcid.org/0000-0003-2706-0436)
- H. Shimizu (ORCID: https://orcid.org/0000-0002-6599-5358)
- T. Yorita (ORCID: https://orcid.org/0009-0008-9147-5226)
- A. O. Tokiyasu (ORCID: https://orcid.org/0000-0001-8761-4782)
- Chihiro Yoshida (ORCID: https://orcid.org/0000-0001-6411-6852)
- S. Suzuki
- S. Y. Ryu (ORCID: https://orcid.org/0000-0002-8593-4747)
- Kosuke Nishi (ORCID: https://orcid.org/0000-0003-4205-8465)
- N. Muramatsu (ORCID: https://orcid.org/0000-0002-8473-9528)
- G. Kojima
- K. Mizutani (ORCID: https://orcid.org/0009-0003-0800-441X)
- T. Nakano (ORCID: https://orcid.org/0000-0003-3157-5328)
- Reiko Kobayakawa (ORCID: https://orcid.org/0000-0001-6613-5969)
- Shuta Tanaka (ORCID: https://orcid.org/0000-0002-8796-1992)
- S. Ajimura (ORCID: https://orcid.org/0000-0003-0998-0933)
- M. Miyabe
- H. Kohri (ORCID: https://orcid.org/0000-0001-6212-3426)
- Kenichi Watanabe (ORCID: https://orcid.org/0000-0002-6063-8044)
- Bing Yan (ORCID: https://orcid.org/0000-0002-0216-9454)
- Toshikazu Hashimoto (ORCID: https://orcid.org/0000-0002-7067-3580)
- C. Rangacharyulu
- M. Sumihama
- M. Niiyama
- S. Daté
- Y. Asano
- T. Nam
- H. Katsuragawa
- J. K. Ahn (ORCID: https://orcid.org/0009-0006-4897-7453)
- Y. Sada
- Yue Ma (ORCID: https://orcid.org/0000-0001-8412-8308)
Publication Details
- Journal
- ArXiv.org
- Published
- 2025-03-04
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00