2017年2月
A new search for the K-L ->pi(0) nu(nu)over-barand K-L -> pi X-0(0) decays
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
- 巻
- 号
- 2
- 記述言語
- 英語
- 掲載種別
- 研究論文（学術雑誌）
- DOI
- 10.1093/ptep/ptx001
- 出版者・発行元
- OXFORD UNIV PRESS INC
We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to<br />
\pi^0 \nu \overline{\nu}$, in data from the first 100 hours of physics running<br />
in 2013 of the J-PARC KOTO experiment. One candidate event was observed while<br />
$0.34\pm0.16$ background events were expected. We set an upper limit of<br />
$5.1\times10^{-8}$ for the branching fraction at the 90\% confidence level<br />
(C.L.). An upper limit of $3.7\times10^{-8}$ at the 90\% C.L. for the $K_{L}<br />
\to \pi^{0} X^{0}$decay was also set for the first time, where $X^{0}$ is an<br />
invisible particle with a mass of 135 MeV/$c^{2}$.
\pi^0 \nu \overline{\nu}$, in data from the first 100 hours of physics running<br />
in 2013 of the J-PARC KOTO experiment. One candidate event was observed while<br />
$0.34\pm0.16$ background events were expected. We set an upper limit of<br />
$5.1\times10^{-8}$ for the branching fraction at the 90\% confidence level<br />
(C.L.). An upper limit of $3.7\times10^{-8}$ at the 90\% C.L. for the $K_{L}<br />
\to \pi^{0} X^{0}$decay was also set for the first time, where $X^{0}$ is an<br />
invisible particle with a mass of 135 MeV/$c^{2}$.
- リンク情報
- ID情報
-
- DOI : 10.1093/ptep/ptx001
- ISSN : 2050-3911
- arXiv ID : arXiv:1609.03637
- Web of Science ID : WOS:000397271100001