Radiative μ and τ leptonic decays at NLO

Fael, Matteo; Mercolli, Lorenzo; Passera, Massimo (2015). Radiative μ and τ leptonic decays at NLO. Journal of High Energy Physics, 2015(7) Springer 10.1007/JHEP07(2015)153

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We present the differential rates and branching ratios of the radiative decays τ→lννγ, with l = e or μ, and μ→eννγ in the Standard Model at next-to-leading order. Radiative corrections are computed taking into account the full depencence on the mass m l 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 m l → 0 limit. Our results agree with the measurements of the branching ratios B(μ→eννγ) and B(τ→μννγ) 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 B(τ→eννγ), for the same photon energy threshold, differs from our prediction by 3.5 standard deviations.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Fael, Matteo; Mercolli, Lorenzo and Passera, Massimo

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

04 Sep 2015 15:10

Last Modified:

04 Sep 2015 15:10

Publisher DOI:

10.1007/JHEP07(2015)153

ArXiv ID:

1506.03416v1

BORIS DOI:

10.7892/boris.71445

URI:

https://boris.unibe.ch/id/eprint/71445

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