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Keywords = radiative muon capture

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16 pages, 964 KB  
Review
Muon to Positron Conversion
by MyeongJae Lee and Michael MacKenzie
Universe 2022, 8(4), 227; https://doi.org/10.3390/universe8040227 - 7 Apr 2022
Cited by 8 | Viewed by 3505
Abstract
Lepton-flavor violation (LFV) has been discovered in the neutrino sector by neutrino oscillation experiments. The minimal extension of the Standard Model (SM) to include neutrino masses allows LFV in the charged sector (CLFV) at the loop level, but at rates that are too [...] Read more.
Lepton-flavor violation (LFV) has been discovered in the neutrino sector by neutrino oscillation experiments. The minimal extension of the Standard Model (SM) to include neutrino masses allows LFV in the charged sector (CLFV) at the loop level, but at rates that are too small to be experimentally observed. Lepton-number violation (LNV) is explicitly forbidden even in the minimally extended SM, so the observation of an LNV process would be unambiguous evidence of physics beyond the SM. The search for the LNV and CLFV process μ+N(A,Z)e++N(A,Z2) (referred to as μe+) complements 0νββ decay searches, and is sensitive to potential flavor effects in the neutrino mass-generation mechanism. A theoretical motivation for μe+ is presented along with a review of the status of past μe+ experiments and future prospects. Special attention is paid to an uncertain and potentially dominant background for these searches, namely, radiative muon capture (RMC). The RMC high energy photon spectrum is theoretically understudied and existing measurements insufficiently constrain this portion of the spectrum, leading to potentially significant impacts on current and future μe+ work. Full article
(This article belongs to the Special Issue Charged Lepton Flavor Violation)
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