The μ → eγ decay in a systematic effective field theory approach with dimension 6 operators

A bstract We implement a systematic effective field theory approach to the benchmark process μ → e γ, performing automated one-loop computations including dimension 6 operators and studying their anomalous dimensions. We obtain limits on Wilson coefficients of a relevant subset of lepton-flavour vio...

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Bibliographic Details
Published in:The journal of high energy physics 2014-10, Vol.2014 (10), Article 14
Main Authors: Pruna, G. M., Signer, A.
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Elementary Particles
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
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Summary:A bstract We implement a systematic effective field theory approach to the benchmark process μ → e γ, performing automated one-loop computations including dimension 6 operators and studying their anomalous dimensions. We obtain limits on Wilson coefficients of a relevant subset of lepton-flavour violating operators that contribute to the branching ratio μ → e γ at one-loop. In addition, we illustrate a method to extract further constraints induced by the mixing of operators under renormalisation-group evolution. This results in limits on the corresponding Wilson coefficients directly at the high scale. The procedure can be applied to other processes as well and, as an example, we consider also lepton-flavour violating decays of the τ .
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP10(2014)014