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Abstract
The spontaneous muonium-to-antimuonium conversion is one of the interesting charged lepton flavor violation processes. MACE is the next generation experiment to probe such a phenomenon. In models with a triplet Higgs to generate neutrino masses, such as Type-II seesaw and its variant, this process can be induced by the doubly-charged Higgs contained in it. In this article, we study the prospect of MACE to probe these models via the muonium-to-antimuonium transitions. After considering the limits from $\mu^+ \rightarrow e^+ \gamma $ and $\mu^+ \rightarrow e^+ e^- e^+$, we find that MACE could probe a parameter space for the doubly-charged Higgs which is beyond the reach of LHC and other flavor experiments.
Highlights
The observation of neutrino oscillations has indicated that neutrinos have very tiny but nonzero masses, which is one of the direct evidences towards the new physics (NP) beyond the Standard Model (SM)
We have discussed prospects of the proposed Muonium-to-Antimuonium Conversion Experiment (MACE) experiment to search for the muonium-to-antimuonium conversion process in the typeII and hybrid seesaw models, the latter of which is an extension of the type-II seesaw by including a single heavy right-handed neutrino
Note that the leading-order contributions to the M − Mconversion probability in both models are induced at tree level by the doubly charged scalar originated in the SUð2ÞL triplet scalar
Summary
The observation of neutrino oscillations has indicated that neutrinos have very tiny but nonzero masses, which is one of the direct evidences towards the new physics (NP) beyond the Standard Model (SM). During the past two decades, there has not been any experimental improvement in this important cLFV channel This situation is expected to soon change in the near future due to the advent of the Muonium-to-Antimuonium Conversion Experiment (MACE) in China [21]. In light of promising experimental developments projected by MACE, it is timely to investigate the muoniumto-antimuonium conversion in more detail, paying attention to its interplay with other flavor and collider searches in probing the model parameter space of interest.
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