Search for lepton-number- and baryon-number-violating tau decays at Belle

Sahoo, D.*; Tanida, Kiyoshi ; Belle Collaboration*; 223 of others*

We search for lepton-number- and baryon-number-violating decays $tau^{-}tooverline{p}e^{+}e^{-}$ , $pe^{-}e^{-}$ , $overline{p}e^{+}mu^{-}$ , $overline{p}e^{-}mu^{+}$ , $overline{p}mu^{+}mu^{-}$ , and $pmu^{-}mu^{-}$ using 921 fb $^{-1}$ of data, equivalent to $tau^{+}tau^{-}$ 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 - $4.0)times 10^{-8}$ . 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.

Language	:	English
Journal	:	Physical Review D
Volume	:	102
Number	:	11
Pages	:	p.111101_1 - 111101_9
Publication Year/Month	:	2020/12
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Paper URL	:	https://doi.org/10.1103/PhysRevD.102.111101
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Keywords	:	no keyword
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Article of JAEA R&D Review	:
Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20210365
JAEA Abstracts No. : 50000393
Paper Submission No. : 25144

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