title: Observation of radiative leptonic decay of the tau lepton
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.
authors.affiliation: University of Illinois, Urbana-Champaign, Illinois 61801, USA.
authors.initials: G
authors.lastname: Viehhauser
authors.initials: JC
authors.lastname: Wang
authors.initials: A
authors.lastname: Wolf
authors.initials: J
authors.lastname: Wu
authors.initials: SE
authors.lastname: Csorna
authors.initials: KW
authors.lastname: McLean
authors.initials: S
authors.lastname: Marka
authors.initials: Z
authors.lastname: Xu
authors.initials: R
authors.lastname: Godang
authors.initials: K
authors.lastname: Kinoshita
authors.initials: IC
authors.lastname: Lai
authors.initials: S
authors.lastname: Schrenk
authors.initials: G
authors.lastname: Bonvicini
authors.initials: D
authors.lastname: Cinabro
authors.initials: R
authors.lastname: Greene
authors.initials: LP
authors.lastname: Perera
authors.initials: GJ
authors.lastname: Zhou
authors.initials: S
authors.lastname: Chan
authors.initials: G
authors.lastname: Eigen
authors.initials: E
authors.lastname: Lipeles
authors.initials: M
authors.lastname: Schmidtler
authors.initials: A
authors.lastname: Shapiro
authors.initials: WM
authors.lastname: Sun
authors.initials: J
authors.lastname: Urheim
authors.initials: AJ
authors.lastname: Weinstein
authors.initials: F
authors.lastname: Wurthwein