Limits on Lepton Flavor Violation from \mu-e-conversion
Abstract
We revisit the status of Lepton Flavor Violating (LFV) \mu e qq contact interactions from the view point of \mu - e -conversion in nuclei. We consider their contribution to this LFV process via the two mechanisms on the hadronic level: direct nucleon and meson exchange ones. In the former case the quarks are embedded directly into the nucleons while in the latter in mesons which then interact with nucleons in a nucleus. We revise and in some cases reevaluate the hadronic parameters relevant for both mechanisms and calculate the contribution of the above mentioned contact interactions in coherent \mu - e -conversion in various nuclei. Then we update the existing upper bounds and also derive new ones for the scales of the \mu e qq contact interactions from the experimental limits on the capture rates of \mu - e -conversion. We compare these limits with the ones derived in the literature from other LFV processes and comment on the prospects of LHC searches related to the contact \mu e qq interactions.
Keywords
Cite
@article{arxiv.1303.0596,
title = {Limits on Lepton Flavor Violation from \mu-e-conversion},
author = {Marcela Gonzalez and Thomas Gutsche and Juan Carlos Helo and Sergey Kovalenko and Valery E. Lyubovitskij and Ivan Schmidt},
journal= {arXiv preprint arXiv:1303.0596},
year = {2015}
}
Comments
15 pages, 1 figure, text partially modified, typo in eq. (5) fixed, results and conclusions unchanged