Searches for Lepton Flavor Violation in the Decays tau -> e gamma and tau -> mu gamma
arXiv:0908.2381 · doi:10.1103/PhysRevLett.104.021802
Abstract
Searches for lepton-flavor-violating decay of a tau lepton to a lighter mass lepton and a photon have been performed with the entire dataset of (963 +- 7) x 10^6 tau decays collected by the BaBar detector near the Upsilon(4S), Upsilon(3S) and Upsilon(2S) resonances. The searches yield no evidence of signals and we set upper limits on the branching fractions of BR(tau -> e gamma) < 3.3 x 10^-8 and BR(tau -> mu gamma) < 4.4 x 10^-8 at 90% confidence level.
7 pages, 2 encapsulated postscript figures, Physical Review Letters 104 (2010) 021802