Improved Limits on Lepton-Flavor-Violating Decays of Light Pseudoscalars via Spin-Dependent µâe Conversion in Nuclei.
Phys Rev Lett
; 130(13): 131902, 2023 Mar 31.
Article
em En
| MEDLINE
| ID: mdl-37067325
ABSTRACT
Lepton-flavor-violating decays of light pseudoscalars, P=π^{0},η,η^{'}âµe, are stringently suppressed in the standard model up to tiny contributions from neutrino oscillations, so that their observation would be a clear indication for physics beyond the standard model. However, in effective field theory such decays proceed via axial-vector, pseudoscalar, or gluonic operators, which are, at the same time, probed in spin-dependent µâe conversion in nuclei. We derive master formulas that connect both processes in a model-independent way in terms of Wilson coefficients and study the implications of current µâe limits in titanium for the Pâµe decays. We find that these indirect limits surpass direct ones by many orders of magnitude.
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MEDLINE
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En
Ano de publicação:
2023
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Article