Search for the decay KL0→3γ

作     者：Y. C. Tung Y. B. Hsiung J. K. Ahn Y. Akune V. Baranov K. F. Chen J. Comfort M. Doroshenko Y. Fujioka T. Inagaki S. Ishibashi N. Ishihara H. Ishii E. Iwai T. Iwata I. Kato S. Kobayashi S. Komatsu T. K. Komatsubara A. S. Kurilin E. Kuzmin A. Lednev H. S. Lee S. Y. Lee G. Y. Lim J. Ma T. Matsumura A. Moisseenko H. Morii T. Morimoto Y. Nakajima T. Nakano H. Nanjo N. Nishi J. Nix T. Nomura M. Nomachi R. Ogata H. Okuno K. Omata G. N. Perdue S. Perov S. Podolsky S. Porokhovoy K. Sakashita T. Sasaki N. Sasao H. Sato T. Sato M. Sekimoto T. Shimogawa T. Shinkawa Y. Stepanenko Y. Sugaya A. Sugiyama T. Sumida S. Suzuki Y. Tajima S. Takita Z. Tsamalaidze T. Tsukamoto Y. Wah H. Watanabe M. L. Wu M. Yamaga T. Yamanaka H. Y. Yoshida Y. Yoshimura Y. Zheng 

作者机构：Department of Physics National Taiwan University Taipei Taiwan 10617 Republic of China Department of Physics Pusan National University Busan 609-735 Republic of Korea Department of Physics Saga University Saga 840-8502 Japan Laboratory of Nuclear Problems Joint Institute for Nuclear Research Dubna Moscow Region 141980 Russia Department of Physics and Astronomy Arizona State University Tempe Arizona USA Department of Particle and Nuclear Research The Graduate University for Advanced Science (SOKENDAI) Tsukuba Ibaraki 305-0801 Japan Institute of Particle and Nuclear Studies High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Department of Physics Osaka University Toyonaka Osaka 560-0043 Japan Department of Physics Yamagata University Yamagata 990-8560 Japan Institute for High Energy Physics Protvino Moscow region 142281 Russia Enrico Fermi Institute University of Chicago Chicago Illinois 60637 USA Department of Applied Physics National Defense Academy Yokosuka Kanagawa 239-8686 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan Research Center of Nuclear Physics Osaka University Ibaraki Osaka 567-0047 Japan 

出 版 物：《Physical Review D》 (物理学评论D辑：粒子、场、重力与宇宙学)

年 卷 期：2011年第83卷第3期

页      面：031101(R)-031101(R)页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：MEXT, Japan JSPS, Japan National Science Council Ministry of Education in Taiwan U.S. Department of Energy Korea Research Foundation 

主　　题：DECAY schemes (Radioactivity) RADIOACTIVE decay BRANCHING ratios (Nuclear physics) OBSERVED confidence levels (Statistics) GRAVITATIONAL fields COSMOLOGY 

摘      要：We performed a search for the decay KL0→3γ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of KL0→3γ proceeding via parity-violation, we obtained the single event sensitivity to be (3.23±0.14)×10−8, and set an upper limit on the branching ratio to be 7.4×10−8 at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of KL0→3γ proceeding via parity-conservation were also presented in this paper.