Search for Lepton Flavor Violation in the Decay tau -> mu gamma
B. Aubert, et al, The BABAR Collaboration

TL;DR
This paper reports a search for lepton flavor violation in tau decays, specifically tau -> mu gamma, using a large dataset from the BABAR detector, and sets a new upper limit on its branching ratio.
Contribution
The study provides the most stringent upper limit to date on the branching ratio of tau -> mu gamma decay, improving constraints on new physics models.
Findings
No evidence for tau -> mu gamma decay was observed.
Upper limit on BR(tau -> mu gamma) < 6.8 x 10^-8 at 90% CL.
Large dataset of 2.07 x 10^8 tau pairs analyzed.
Abstract
A search for the nonconservation of lepton flavor number in the decay tau -> mu gamma has been performed using 2.07 x 10^8 e+e- -> tau+ tau- events produced at a center-of-mass energy near 10.58 GeV with the BABAR detector at the PEP-II storage ring. We find no evidence for a signal and set an upper limit on the branching ratio of BR(tau -> mu gamma) < 6.8 x 10^-8 at 90% confidence level.
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