2022年8月26日(金)16:30 - 18:00 (JST)

• 冨田 夏希 (京都大学 大学院理学研究科 附属サイエンス連携探索センター (SACRA) 特定助教)

ホスト
Tetsuo Hatsuda

A large mass reduction of eta'(958) meson in nuclear medium owing to its UA(1) anomaly is expected in several model calculations. We carried out the LEPS2/BGOegg experiment at SPring-8 to study eta' meson properties in nuclei. If there is a large mass reduction in nuclei, an eta' meson and a nucleus may form a bound state. We searched for the eta'-nucleus bound states via missing mass spectroscopy of the 12C(gamma, p) reaction. To suppress background events from multi-meson production, we simultaneously measured decay products from the eta'-nucleus system for the first time.
We also carried out the missing mass spectroscopy simultaneously detecting an eta' meson escaping from a nucleus for the first time. We will show the experimental results and comparisons with theoretical calculations. We will also show the preliminary results of the line shape analysis of the invariant mass spectra of the eta'->2gamma decay in the gamma+12C->eta'+X reaction.

## Reference

1. N. Tomida et al. (LEPS2/BGOegg Collaboration), Search for η ′ Bound Nuclei in the 12 C ( γ , p ) Reaction with Simultaneous Detection of Decay Products, Phys. Rev. Lett. 124, 202501 (2020), doi: 10.1103/PhysRevLett.124.202501

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