EPJ Web of Conferences
Volume 118, 2016International Workshop on “Flavour Changing and Conserving Processes” 2015 (FCCP 2015)
|Number of page(s)||7|
|Published online||26 April 2016|
Lepton-flavour violating decays in theories with dimension 6 operators
1 Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2 Physik-Institut, Universität Zürich, CH-8057 Zürich Switzerland
Published online: 26 April 2016
Despite a large experimental effort, so far no evidence for flavour-violating decays of charged leptons such as li → ljγ and li → ljlklk 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→ µe are much more constrained from low-energy experiments µ → eγ than from the limits of current and future direct searches at high energy.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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