Limits on Lepton Flavor Violation from \mu-e-conversion

Understand

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.