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Probing the doubly-charged Higgs with Muonium to Antimuonium Conversion Experiment

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arxiv 2102.00758 v1 pith:UJQXHMRB submitted 2021-02-01 hep-ph hep-ex

Probing the doubly-charged Higgs with Muonium to Antimuonium Conversion Experiment

classification hep-ph hep-ex
keywords higgsdoubly-chargedmaceprobeconversionexperimentflavormodels
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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