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

Conference · Wed Apr 29 00:00:00 EDT 2015

OSTI ID:1178981

Oberhof, Benjamin ^[1]

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1. Dipartimento di Fisica Universita di Pisa, Pisa (Italy); Laboratori Nazionali dell'INFN, Frascati (Italy). et al.

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.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: BABAR Collaboration
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1178981
• Report Number(s): SLAC-PUB-16271; arXiv:1502.01810; TRN: US1600140
• Resource Relation: Conference: 13. International Workshop on Tau Lepton Physics, Aachen (Germany), 15-19 Sep 2014
• Country of Publication: United States
• Language: English

Related Subjects

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