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Observation of radiative leptonic decay of the tau lepton
Ammar, Raymond G. Baringer, Philip S. Bean, Alice Besson, David Zeke Davis, Robin E. P. Kotov, S. Kravchenko, I. Kwak, Nowhan Zhao, X.
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Davis, Robin E. P.
Kotov, S.
Kravchenko, I.
Kwak, Nowhan
Zhao, X.
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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)mu(-)<<(nu)over bar>(mu)gamma and tau- --> nu(tau)e(-)<(nu)over bar>(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) x 10(-3) or (1.75 +/- 0.06 +/- 0.17) x 10(-2), respectively. The branching fractions are in agreement with standard model theoretical predictions.
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2000-01
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AMERICAN PHYSICAL SOC
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Bergfeld, T, Eisenstein, BI, et al. Observation of radiative leptonic decay of the tau lepton. PHYSICAL REVIEW LETTERS. January 2000. 84(5) : 830-834