Hoferichter, Martin; Menéndez, Javier; Noël, Frederic (2023). Improved Limits on Lepton-Flavor-Violating Decays of Light Pseudoscalars via Spin-Dependent μ→e Conversion in Nuclei. Physical review letters, 130(13), p. 131902. American Physical Society 10.1103/PhysRevLett.130.131902
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Lepton-flavor-violating decays of light pseudoscalars, P=π^{0},η,η^{'}→μe, 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 μ→e 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 μ→e limits in titanium for the P→μe decays. We find that these indirect limits surpass direct ones by many orders of magnitude.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Hoferichter, Martin, Noël, Frederic |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1079-7114 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
18 Apr 2023 10:36 |
Last Modified: |
23 Apr 2023 02:21 |
Publisher DOI: |
10.1103/PhysRevLett.130.131902 |
PubMed ID: |
37067325 |
BORIS DOI: |
10.48350/181804 |
URI: |
https://boris.unibe.ch/id/eprint/181804 |
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