Limits on lepton flavor violation from μ--e- conversion

We revisit the status of lepton flavor violating (LFV) mu eqq 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 our previous upper bounds and derive new ones for the scales of the mu eqq 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 eqq interactions.