Authors: M Fael L Mercolli M Passera
Publish Date: 2015/07/28
Volume: 2015, Issue: 7, Pages: 153-
Abstract
We present the differential rates and branching ratios of the radiative decays tau to loverlinenunu gamma with l = e or μ and mu to eoverlinenunu gamma in the Standard Model at nexttoleading order Radiative corrections are computed taking into account the full depencence on the mass ml of the final charged leptons which is necessary for the correct determination of the branching ratios Only partial agreement is found with previous calculations performed in the ml → 0 limit Our results agree with the measurements of the branching ratios mathrmmathcalBleftmu to eoverlinenunu gamma right and mathrmmathcalBlefttau to mu overlinenunu gamma right for a minimum photon energy of 10 MeV in the μ and τ rest frames respectively Babar’s recent precise measurement of the branching ratio mathrmmathcalBlefttau to eoverlinenunu gamma right for the same photon energy threshold differs from our prediction by 35 standard deviationsThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team
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