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

Collaboration
Oct 29, 2020
8 pages
Published in:
  • Phys.Rev.D 102 (2020) 111101
  • Published: Dec 24, 2020
e-Print:
DOI:
Report number:
  • Belle Preprint 2020-16,
  • KEK Preprint 2020-33
Experiments:
View in:
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Abstract: (arXiv)
We search for lepton-number- and baryon-number-violating decays τ−→p‾e+e−\tau^{-}\to\overline{p}e^{+}e^{-}, pe−e−pe^{-}e^{-}, p‾e+μ−\overline{p}e^{+}\mu^{-}, p‾e−μ+\overline{p}e^{-}\mu^{+}, p‾μ+μ−\overline{p}\mu^{+}\mu^{-}, and pμ−μ−p\mu^{-}\mu^{-} using 921 fb−1^{-1} of data, equivalent to (841±12)×106(841\pm12)\times 10^6 τ+τ−\tau^{+}\tau^{-} events, recorded with the Belle detector at the KEKB asymmetric-energy e+e−e^{+}e^{-} collider. In the absence of a signal, 90%90\% confidence-level upper limits are set on the branching fractions of these decays in the range (1.8(1.8-4.0)×10−84.0)\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.
Note:
  • 8 pages, 5 figures, 1 table
  • electron positron: annihilation
  • electron positron: colliding beams
  • tau: pair production
  • lepton number: violation
  • baryon number: violation
  • tau: rare decay
  • tau: semileptonic decay
  • electron: pair production
  • muon: pair production
  • BELLE
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