A new search for the K_{L} to π⁰ ν overline{ν} and K_{L} to π⁰ X⁰ decays

J. K. Ahn , K. Y. Baek , S. Banno , B. Beckford , B. Brubaker , T. Cai , M. Campbell , C. Carruth

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S. H. Chen S. Chu J. Comfort Y. T. Duh T. Furukawa H. Haraguchi T. Hineno Y. B. Hsiung M. Hutcheson T. Inagaki M. Isoe E. Iwai T. Kamibayashi I. Kamiji N. Kawasaki E. J. Kim Y. J. Kim J. W. Ko T. K. Komatsubara A. S. Kurilin G. H. Lee H. S. Lee J. W. Lee S. K. Lee G. Y. Lim C. Lin J. Ma Y. Maeda T. Masuda T. Matsumura D. Mcfarland J. Micallef K. Miyazaki K. Morgan R. Murayama D. Naito K. Nakagiri Y. Nakajima Y. Nakaya H. Nanjo T. Nomura Y. Odani R. Ogata H. Okuno T. Ota Y. D. Ri M. Sasaki N. Sasao K. Sato T. Sato S. Seki T. Shimogawa T. Shinkawa S. Shinohara K. Shiomi J. S. Son J. Stevens S. Su Y. Sugiyama S. Suzuki Y. Tajima G. Takahashi Y. Takashima M. Tecchio I. Teo M. Togawa T. Toyoda Y. C. Tung T. Usuki Y. W. Wah H. Watanabe N. Whallon J. K. Woo J. Xu M. Yamaga S. Yamamoto T. Yamanaka H. Yamauchi Y. Yanagida H. Yokota H. Y. Yoshida H. Yoshimoto

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classification ✦ hep-ex

keywords decayfirstlimitoverlinetimes10upperbackgroundbranching

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We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to \pi^0 \nu \overline{\nu}$, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while $0.34\pm0.16$ background events were expected. We set an upper limit of $5.1\times10^{-8}$ for the branching fraction at the 90\% confidence level (C.L.). An upper limit of $3.7\times10^{-8}$ at the 90\% C.L. for the $K_{L} \to \pi^{0} X^{0}$decay was also set for the first time, where $X^{0}$ is an invisible particle with a mass of 135 MeV/$c^{2}$.

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A new search for the K_{L} to π⁰ ν overline{ν} and K_{L} to π⁰ X⁰ decays

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