陶轻子辐射轻子衰变的观测

Observation of radiative leptonic decay of the tau lepton.

作者信息

Viehhauser G, Wang JC, Wolf A, Wu J, Csorna SE, McLean KW, Marka S, Xu Z, Godang R, Kinoshita K, Lai IC, Schrenk S, Bonvicini G, Cinabro D, Greene R, Perera LP, Zhou GJ, Chan S, Eigen G, Lipeles E, Schmidtler M, Shapiro A, Sun WM, Urheim J, Weinstein AJ, Wurthwein F

机构信息

University of Illinois, Urbana-Champaign, Illinois 61801, USA.

出版信息

Phys Rev Lett. 2000 Jan 31;84(5):830-4. doi: 10.1103/PhysRevLett.84.830.

DOI:10.1103/PhysRevLett.84.830

PMID:11017384

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.

摘要

利用在康奈尔电子储存环上使用CLEO II探测器收集的4.68 fb(-1)的正负电子湮灭数据，我们研究了τ轻子的辐射衰变τ(-)-->ν(τ)μ(-)ν(μ)γ和τ(-)-->ν(τ)e(-)ν(e)γ。对于τ静止参考系中最小光子能量为10 MeV的情况，测量到辐射τ轻子衰变为μ子或电子的分支比分别为(3.61±0.16±0.35)×10^(-3)或(1.75±0.06±0.17)×10^(-2)。这些分支比与标准模型理论预测相符。