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

(Belle Collaboration)

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We search for lepton-number- and baryon-number-violating decays τ-→p¯e+e-, pe-e-, p¯e+μ-, p¯e-μ+, p¯μ+μ-, and pμ-μ- using 921 fb-1 of data, equivalent to (841±12)×106 τ+τ- 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)×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.

Original languageEnglish
Article number111101
JournalPhysical Review D
Issue number11
StatePublished - 24 Dec 2020


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