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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2020/10 |
| 形態種別 | その他 |
| 標題 | Search for lepton-number- and baryon-number-violating tau decays at Belle |
| 執筆形態 | その他 |
| 著者・共著者 | D. Sahoo,G. B. Mohanty,K. Trabelsi,I. Adachi,K. Adamczyk,H. Aihara,S. Al Said,D. M. Asner,T. Aushev,R. Ayad,T. Aziz,V. Babu,S. Bahinipati,P. Behera,J. Bennett,M. Bessner,V. Bhardwaj,T. Bilka,J. Biswal,G. Bonvicini,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,P. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,S. Das,N. Dash,G. De Nardo,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,S. Du |
| 概要 | We search for lepton-number- and baryon-number-violating decays
$\tau^{-}\to\overline{p}e^{+}e^{-}$, $pe^{-}e^{-}$, $\overline{p}e^{+}\mu^{-}$, $\overline{p}e^{-}\mu^{+}$, $\overline{p}\mu^{+}\mu^{-}$, and $p\mu^{-}\mu^{-}$ using 921 fb$^{-1}$ of data, equivalent to $(841\pm12)\times 10^6$ $\tau^{+}\tau^{-}$ events, recorded with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. In the absence of a signal, $90\%$ confidence-level upper limits are set on the branching fractions of these decays in the range $(1.8$-$4.0)\times 10^{-8}$. We set the world's first limits on the first four channels and improve the existing limits by an order of magnitude for the last two channels. |
| DOI | 10.1103/PhysRevD.102.111101 |
| PermalinkURL | http://arxiv.org/abs/2010.15361v2 |
| researchmap用URL | http://arxiv.org/pdf/2010.15361v2 |