Fully differential NLO predictions for the radiative decay of muons and taus
We present a general purpose Monte Carlo program for the calculation of the radiative muon decay μ→eνν¯γ and the radiative decays τ→eνν¯γ and τ→μνν¯γ at next-to-leading order in the Fermi theory. The full dependence on the lepton masses and polarization of the initial-sate lepton are kept. We study...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-09-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269317305555 |
| _version_ | 1818272496525246464 |
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| author | G.M. Pruna A. Signer Y. Ulrich |
| author_facet | G.M. Pruna A. Signer Y. Ulrich |
| author_sort | G.M. Pruna |
| collection | DOAJ |
| description | We present a general purpose Monte Carlo program for the calculation of the radiative muon decay μ→eνν¯γ and the radiative decays τ→eνν¯γ and τ→μνν¯γ at next-to-leading order in the Fermi theory. The full dependence on the lepton masses and polarization of the initial-sate lepton are kept. We study the branching ratios for these processes and show that fully-differential next-to-leading order corrections are important for addressing a tension between BaBar's recent measurement of the branching ratio B(τ→eνν¯γ) and the Standard Model prediction. In addition, we study various distributions of the process μ→eνν¯γ and obtain precise predictions for the irreducible background to μ→eγ searches, tailored to the geometry of the MEG detector. |
| first_indexed | 2024-12-12T21:43:00Z |
| format | Article |
| id | doaj.art-15f289c3de9749678de7adcc85bf376f |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-12T21:43:00Z |
| publishDate | 2017-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-15f289c3de9749678de7adcc85bf376f2022-12-22T00:11:00ZengElsevierPhysics Letters B0370-26931873-24452017-09-01772C45245810.1016/j.physletb.2017.07.008Fully differential NLO predictions for the radiative decay of muons and tausG.M. Pruna0A. Signer1Y. Ulrich2Paul Scherrer Institut, CH-5232 Villigen PSI, SwitzerlandPaul Scherrer Institut, CH-5232 Villigen PSI, SwitzerlandPaul Scherrer Institut, CH-5232 Villigen PSI, SwitzerlandWe present a general purpose Monte Carlo program for the calculation of the radiative muon decay μ→eνν¯γ and the radiative decays τ→eνν¯γ and τ→μνν¯γ at next-to-leading order in the Fermi theory. The full dependence on the lepton masses and polarization of the initial-sate lepton are kept. We study the branching ratios for these processes and show that fully-differential next-to-leading order corrections are important for addressing a tension between BaBar's recent measurement of the branching ratio B(τ→eνν¯γ) and the Standard Model prediction. In addition, we study various distributions of the process μ→eνν¯γ and obtain precise predictions for the irreducible background to μ→eγ searches, tailored to the geometry of the MEG detector.http://www.sciencedirect.com/science/article/pii/S0370269317305555 |
| spellingShingle | G.M. Pruna A. Signer Y. Ulrich Fully differential NLO predictions for the radiative decay of muons and taus Physics Letters B |
| title | Fully differential NLO predictions for the radiative decay of muons and taus |
| title_full | Fully differential NLO predictions for the radiative decay of muons and taus |
| title_fullStr | Fully differential NLO predictions for the radiative decay of muons and taus |
| title_full_unstemmed | Fully differential NLO predictions for the radiative decay of muons and taus |
| title_short | Fully differential NLO predictions for the radiative decay of muons and taus |
| title_sort | fully differential nlo predictions for the radiative decay of muons and taus |
| url | http://www.sciencedirect.com/science/article/pii/S0370269317305555 |
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