Limits on Lepton Flavor Violation from μ-e-conversion

Abstract

We revisit the status of Lepton Flavor Violating (LFV) μe qq contact interactions from the view point of μ- 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 μ- e -conversion in various nuclei. Then we update the existing upper bounds and also derive new ones for the scales of the μe qq contact interactions from the experimental limits on the capture rates of μ- 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 μe qq interactions.

15 pages, 1 figure, text partially modified, typo in eq. (5) fixed, results and conclusions unchanged

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• On nature of the scalar-isoscalar mesons in the uniformizing-variable method based on analyticity and unitarity
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Cited by in corpus (9)

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• Deep inelastic $e-\tau$ and $\mu -\tau$ conversion in the NA64 experiment at the CERN SPS
• Non-Standard Neutrino Interactions : Obviating Oscillation Experiments
• Lepton Phenomenology of Stueckelberg Portal to Dark Sector
• Sensitivity potential to a light flavor-changing scalar boson with DUNE and NA64$\mu$
• Bounds on lepton flavor violating physics and decays of neutral mesons from $\tau (\mu )\to 3\ell ,\ell \gamma \gamma$-decays
• Conversions of Bound Muons: Lepton Flavour Violation from Doubly Charged Scalars