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Search for the KL-* π0νν Decay at the J-PARC KOTO Experiment
- Ahn, J. K.;
- Farrington, M.;
- Gonzalez, M.;
- Grethen, N.;
- Hanai, K.;
- 외 44명
WEB OF SCIENCE
21SCOPUS
23초록
We performed a search for the KL-* J0vv decay using the data taken in 2021 at the J-PARC KOTO experiment. With newly installed counters and new analysis method, the expected background was suppressed to 0.252 +/- 0.055stat +0.052 -0.067syst. With a single event sensitivity of (9.33 +/- 0.06stat +/- 0.84syst) x 10-10, no events were observed in the signal region. An upper limit on the branching fraction for the decay was set to be 2.2 x 10-9 at the 90% confidence level (C.L.), which improved the previous upper limit from KOTO by a factor of 1.4. With the same data, a search for KL-*J0X0 was also performed, where X0 is an invisible boson with a mass ranging from 1 to 260 MeV/c2. For X0 with a mass of 135 MeV/c2, an upper limit on the branching fraction of KL-* pi 0X0 was set to be 1.6 x 10-9 at the 90% C.L.
키워드
- 제목
- Search for the KL-* π0νν Decay at the J-PARC KOTO Experiment
- 저자
- Ahn, J. K.; Farrington, M.; Gonzalez, M.; Grethen, N.; Hanai, K.; Hara, N.; Haraguchi, H.; Hsiung, Y. B.; Inagaki, T.; Katayama, M.; Kato, T.; Kawata, Y.; Kim, E. J.; Kim, H. M.; Kitagawa, A.; Komatsubara, T. K.; Kotera, K.; Lee, S. K.; Li, X.; Lim, G. Y.; Lin, C.; Luo, Y.; Mari, T.; Matsumura, T.; Morioka, I.; Nanjo, H.; Nishimiya, H.; Noichi, Y.; Nomura, T.; Ono, K.; Osugi, M.; Paschos, P.; Redeker, J.; Sato, T.; Sato, Y.; Shibata, T.; Shimizu, N.; Shinkawa, T.; Shiomi, K.; Shiraishi, R.; Suzuki, S.; Tajima, Y.; Taylor, N.; Tung, Y. C.; Wah, Y. W.; Watanabe, H.; Wu, T.; Yamanaka, T.; Yoshida, H. Y.
- 발행일
- 2025-02-26
- 유형
- Article
- 권
- 134
- 호
- 8