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

Belleにおけるレプトン数およびバリオン数を破るタウ粒子崩壊の探索

Sahoo, D.*; 谷田 聖   ; Belle Collaboration*; 他223名*

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 $$(841pm12)times 10^6$$ $$tau^{+}tau^{-}$$ 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.

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パーセンタイル:26.27

分野:Astronomy & Astrophysics

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