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Lepton-flavour violating decays in theories with dimension 6 operators


Pruna, Giovanni Marco; Signer, Adrian (2016). Lepton-flavour violating decays in theories with dimension 6 operators. EPJ Web of Conferences, 118:01031.

Abstract

Despite a large experimental effort, so far no evidence for flavour-violating decays of charged leptonssuch as l_i -> l_jgamma and l_i -> l_jl_kl_k has been found. The absence of a signal puts very severe constraints on many extensions of the Standard Model. Here we apply a model independent approach by studying such decays in the Standard Model effective field theory. Going beyond leading order in the Standard Model couplings and considering all dimension 6 operators that might lead to lepton-flavour violation, we are able to extract limits on a large number ofWilson coefficients of such operators. We are also able to compare the impact of particular searches and find, for example, that flavour-violating decays of the Z-boson Z-> mue are much more constrained from low-energy experiments mu -> egamma than from the limits of current and future direct searches at high energy.

Abstract

Despite a large experimental effort, so far no evidence for flavour-violating decays of charged leptonssuch as l_i -> l_jgamma and l_i -> l_jl_kl_k has been found. The absence of a signal puts very severe constraints on many extensions of the Standard Model. Here we apply a model independent approach by studying such decays in the Standard Model effective field theory. Going beyond leading order in the Standard Model couplings and considering all dimension 6 operators that might lead to lepton-flavour violation, we are able to extract limits on a large number ofWilson coefficients of such operators. We are also able to compare the impact of particular searches and find, for example, that flavour-violating decays of the Z-boson Z-> mue are much more constrained from low-energy experiments mu -> egamma than from the limits of current and future direct searches at high energy.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2016
Deposited On:03 Jan 2017 08:37
Last Modified:08 Dec 2017 21:44
Publisher:EDP Sciences
ISSN:2100-014X
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1051/epjconf/201611801031

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