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Measurement of the branching fractions of the radiative leptonic tau decays tau -> e gamma nu anti-nu and tau -> mu gamma nu anti-nu at BaBar

Abstract : We perform a measurement of the tau -> l gamma nu anti-nu (l = e, mu) branching fractions for a minimum photon energy of 10 MeV in the tau rest frame, using 431fb^-1 of e^+e^- collisions collected at the center-of-mass energy of the Upsilon(4S) resonance with the BaBar detector at the PEP-II storage rings. We find B(tau -> mu gamma nu anti-nu ) = (3.69pm0.03pm0.10)x10^-3, and B(tau -> e gamma nu anti-nu ) = (1.847pm0.015pm0.052)x10^-2, where the first quoted error is statistical, and the second is systematic. These results are substantially more precise than previous measurements.
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http://hal.in2p3.fr/in2p3-01114481
Contributor : Claudine Bombar <>
Submitted on : Monday, February 9, 2015 - 2:51:54 PM
Last modification on : Friday, November 6, 2020 - 3:31:14 AM

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J.P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Measurement of the branching fractions of the radiative leptonic tau decays tau -> e gamma nu anti-nu and tau -> mu gamma nu anti-nu at BaBar. Physical Review D, American Physical Society, 2015, 91 (5), pp.051103(R). ⟨10.1103/PhysRevD.91.051103⟩. ⟨in2p3-01114481⟩

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