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, 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: |
05 Dec 2022 14:49 |
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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