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Title: Measurement of the branching fractions of radiative leptonic τ decays τ → ℓγν anti-ν (ℓ=e,μ) at BABAR

We perform a measurement of the branching fractions for τ → ℓγν anti ν, (ℓ = e, μ) decays for a minimum photon energy of 10 MeV in the τ rest frame using 430 fb-1 of e+e- collisions collected at the center-of-mass energy of the Υ(4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(τ → μγνν) = (3.69±0.03±0.10)×103 and B(τ → eγνν) = (1.847 ± 0.015 ± 0.052) × 10-2 where the first quoted error is statistical and the second is systematic. These results represent a substantial improvement with respect to existing measurements for both channels.
Authors:
 [1]
  1. Dipartimento di Fisica Universita di Pisa, Pisa (Italy); Laboratori Nazionali dell'INFN, Frascati (Italy). et al.
Publication Date:
OSTI Identifier:
1178981
Report Number(s):
SLAC-PUB--16271
arXiv:1502.01810; TRN: US1600140
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: 13. International Workshop on Tau Lepton Physics, Aachen (Germany), 15-19 Sep 2014
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC), High Energy Physics (HEP)
Contributing Orgs:
BABAR Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; ELECTRON-POSITRON INTERACTIONS; LEPTONIC DECAY; PHOTONS; MEV RANGE 10-100; DATA COVARIANCES; TAU PARTICLES; TAU NEUTRINOS; ANTINEUTRINOS; ELECTRONS; MUONS Experiment-HEP,HEPEX