Search for Lepton Flavor-Violating "tau -> mu gamma" decay

Details Search for Lepton Flavor-Violating "tau -> mu gamma" decay Search for Lepton Flavor-Violating "tau -> mu gamma" decay

2002-10-15

arxiv.org/abs/hep-ex/0210036v1

eConf C0209101 (2002) TU11

Physics

High Energy Physics

High Energy Physics - Experiment

Invited talk at the Seventh International Workshop on Tau Lepton Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 6 pages, LaT

Scientific paper

10.1016/S0920-5632(03)80310-9

We search for the lepton flavor-violating "tau -> mu gamma" decay using 29.7 million tau pairs accumulated by the Belle experiment. The main background sources are found to be tau pairs with "tau -> mu nu nu" decay and radiative dimuon events. One event is observed in the signal region, while 2.5 +- 0.6 background events are expected. A preliminary upper limit Br(tau -> mu gamma) < 6 x 10^{-7} at the 90% confidence limit is obtained.

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