Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-02
Part.Nucl.Lett. 104 (2001) 40-52
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, LaTex, 1 figure. Talk presented by F. Simkovic at the International Workshop on Neutrino Physics (NANPino), JINR, Du
Scientific paper
We study the lepton number violating muon-positron conversion in nuclei mediated by the exchange of virtual light Majorana neutrinos. We found that a previously overlooked imaginary part of this amplitude plays an important role. The numerical calculation has been made for the experimentally interesting muon-positron conversion in Ti48 using realistic renormalized proton-neutron QRPA wave functions. We also discuss the very similar case of the neutrinoless double beta decay of Ca48 The ratio of muon-positron conversion over the total muon absorption has been computed taking into account the current constraints from neutrino oscillation phenomenology. We compare our results with the experimental limits as well as with previous theoretical predictions. We have found that the Majorana neutrino mode of muon-positron conversion in Ti48 is too small to be measurable in the foreseeable future.
Domin Pavol
Faessler Amand
Kovalenko Sergey
Simkovic Fedor
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