Neutrino mediated muon--electron conversion in nuclei revisited

Abstract

The non-photonic neutrino exchange mechanism of the lepton flavor violating muon-electron conversion in nuclei is revisited. First we determine the nucleon coupling constants for the neutrino exchange mechanism in a relativistic quark model taking into account quark confinement and chiral symmetry requirements. This includes a new, previously overlooked tree-level contribution from neutrino exchange between two quarks in the same nucleon. Then for the case of an additional sterile neutrino we reconsider the coherent mode of this process. The presence of a mixed sterile-active neutrino state heavier than the quark confinement scale Lambda_c (~1 GeV) may significantly improve the prospects for observation of this process in future experiments as compared to the conventional scenario with only light neutrinos. Turning the arguments around we derive new experimental constraints on |U_(mu h)| and |U_(e h)| mixing matrix elements from the non-observation of muon--electron conversion.

13 pages, RevTex, 1 Postscript figure

References in corpus (14)

• Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
• Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations
• Approximate Treatment of Lepton Distortion in Charged-Current Neutrino Scattering from Nuclei
• Sigma-term physics in the perturbative chiral quark model
• K-meson neutrinoless double muon decay as a probe of neutrino masses and mixings
• Lepton Flavor Non-Conservation
• Muon-electron conversion in strange quark sea
• Electromagnetic Structure of the Nucleon in the Perturbative Chiral Quark Model
• Sterile neutrinos in tau lepton decays
• piN scattering and electromagnetic corrections in the perturbative chiral quark model
• Exotic muon-electron conversion in nuclei and R-parity violating supersymmetry
• B-quark mediated neutrinoless ${\mu }^{-}-e^{-}$ conversion in presence of R-parity violation
• The MECO experiment: A search for lepton flavor violation in muonic atoms
• Dirac and Majorana heavy neutrinos at LEP II

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• The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings
• Electromagnetic form factors of the baryon octet in the perturbative chiral quark model
• Updated analysis of meson-nucleon sigma terms in the perturbative chiral quark model
• Deep inelastic $e-\tau$ and $\mu -\tau$ conversion in the NA64 experiment at the CERN SPS
• Nuclear muon-positron conversion mediated by Majorana neutrinos
• Nucleon polarizabilities in the perturbative chiral quark model
• Effective Lagrangian approach to nuclear mu-e conversion and the role of vector mesons
• Dependence of nucleon properties on pseudoscalar meson masses
• Chiral Dynamics of Baryons in a Lorentz Covariant Quark Model