Measurement of the Branching Fractions of the Radiative Leptonic τ Decays τ → eγν[bar over ν] and τ → μγν[bar over ν] at BABAR
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PhysRevD.91.051103.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
March 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurement of the Branching Fractions of the Radiative Leptonic τ Decays τ → eγν[bar over ν] and τ → μγν[bar over ν] at BABAR.” Phys. Rev. D 91, no. 5 (March 2015). © 2015 American Physical Society
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Final published version
Abstract
We perform a measurement of the τ → lγν[bar over ν] (l = e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431 fb[superscript -1] of e[superscript +]e[superscript -] 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 → μγν[bar over ν]) = (3.69 ± 0.03 ± 0.10) × 10[superscript -3] and B(τ → eγν[bar over ν]) = (1.847 ± 0.015 ± 0.052) × 10[superscript -2], where the first quoted error is statistical and the second is systematic. These results are substantially more precise than previous measurements.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.051103
