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Search for lepton-flavor-violating tau-lepton decays to ℓγ\ell\gamma at Belle

Collaboration
Mar 24, 2021
16 pages
Published in:
  • JHEP 10 (2021) 19
e-Print:
DOI:
Experiments:
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Abstract: (arXiv)
Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ±→ℓ±γ\tau^{\pm}\rightarrow\ell^{\pm}\gamma (ℓ=e,μ\ell=e,\mu) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ±→ℓ±γ\tau^{\pm}\rightarrow\ell^{\pm}\gamma using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1^{-1}, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B(τ±→μ±γ)\mathcal{B}(\tau^{\pm}\rightarrow \mu^{\pm}\gamma)≤\leq4.2×10−84.2\times10^{-8} and B(τ±→e±γ)\mathcal{B}(\tau^{\pm}\rightarrow e^{\pm}\gamma)≤\leq5.6×10−85.6\times10^{-8}, are set at 90% confidence level.
  • electron positron: annihilation
  • electron positron: colliding beams
  • tau: rare decay
  • lepton: flavor: violation
  • BELLE
  • KEK-B
  • tau: branching ratio: upper limit
  • tau: radiative decay
  • new physics: search for
  • background