Observation of radiative leptonic decay of the tau lepton |
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Authors: | Viehhauser Wang Wolf Wu Csorna McLean Marka Xu Godang Kinoshita Lai Schrenk Bonvicini Cinabro Greene Perera Zhou Chan Eigen Lipeles Schmidtler Shapiro Sun Urheim Weinstein Wurthwein |
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Institution: | University of Illinois, Urbana-Champaign, Illinois 61801, USA. |
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Abstract: | Using 4.68 fb(-1) of e(+)e(-) annihilation data collected with the CLEO II detector at the Cornell Electron Storage Ring, we have studied tau radiative decays tau(-)-->nu(tau)&mgr;(-)nu;(&mgr;)gamma and tau(-)-->nu(tau)e(-)nu;(e)gamma. For a 10 MeV minimum photon energy in the tau rest frame, the branching fraction for radiative tau decay to a muon or electron is measured to be (3.61+/-0.16+/-0. 35)x10(-3) or (1.75+/-0.06+/-0.17)x10(-2), respectively. The branching fractions are in agreement with standard model theoretical predictions. |
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