We perform a measurement of the τ→lγνν¯ (l=e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431fb-1 of e+e- collisions collected at the center-of-mass energy of the (4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(τ→μγνν¯)=(3.69±0.03±0.10)×10-3 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 are substantially more precise than previous measurements.
Measurement of the branching fractions of the radiative leptonic τ decays τ →eγν ν ¯ and τ →μγν ν ¯ at BABAR / Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Stugu, B., Brown, D.N., Kerth, L.T., Kolomensky, Y.u.G., Lee, M.J., Lynch, G., Koch, H., Schroeder, T., Hearty, C., Mattison, T.S., Mckenna, J.A., So, R.Y., Khan, A., Blinov, V.E., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 91:5(2015), pp. 051103.051103-1-051103.051103-8. [10.1103/PhysRevD.91.051103]
Measurement of the branching fractions of the radiative leptonic τ decays τ →eγν ν ¯ and τ →μγν ν ¯ at BABAR
LANCERI, LIVIO;VITALE, LORENZO;
2015-01-01
Abstract
We perform a measurement of the τ→lγνν¯ (l=e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431fb-1 of e+e- collisions collected at the center-of-mass energy of the (4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(τ→μγνν¯)=(3.69±0.03±0.10)×10-3 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 are substantially more precise than previous measurements.| File | Dimensione | Formato | |
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Measurement of the branching fractions of the radiative leptonic τ decays τ →eγν ν ¯ and τ →μγν ν ¯ at BABAR.pdf
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Measurement of the D0 →π-e+νe differential decay branching fraction as a function of q2 and study of form factor parametrizations -postprint.pdf
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