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Lepton flavor physics at $\mu^+ \mu^+$ colliders
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abstract
We discuss sensitivities to lepton flavor violating (and conserving) interactions at future muon colliders, especially at $\mu^+\mu^+$ colliders. Compared with the searches for rare decays of $\mu$ and $\tau$, we find that the TeV-scale future colliders have better sensitivities depending on the pattern of hierarchy in the flavor mixings. As an example, we study the case with the type-II seesaw model, where the flavor mixing parameters have direct relation to the neutrino mass matrix. At a $\mu^+ \mu^+$ collider, the number of events of the $\mu^+ \mu^+ \to \mu^+ \tau^+$ process can be larger than $\mathcal{O}(100)$ with the center of mass energy $\sqrt s = 2$ TeV, and with an integrated luminosity ${\cal L} = 1$ ab$^{-1}$, while satisfying bounds from rare decays of $\mu$ and $\tau$. We discuss impacts of the overall mass scale of neutrinos as well as CP violating phases to the number of expected events.
Forward citations
Cited by 4 Pith papers
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Discovery prospects of a singly-charged scalar at $\mu$TRISTAN
A same-sign muon collider could discover the singly-charged scalar of Type-II seesaw through a lepton-flavor-violating process, and the final lepton flavor could distinguish normal from inverted neutrino mass ordering...
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Multiboson Signatures of Doubly Charged Scalars at a Same-Sign Muon Collider
A same-sign muon collider at 2 TeV with 1 ab^-1 could reach 2-sigma sensitivity to Type-II seesaw doubly charged scalars decaying to WW up to roughly 425-430 GeV, slightly extending current LHC coverage.
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Probing maximal flavor changing $Z'$ in $U(1)_{L_\mu-L_\tau}$ at $\mu$TRISTAN
MuTRISTAN's mu+mu+ mode could discover a mu-tau flavor-changing Z' with gauge coupling near 0.024 for masses around 500 GeV.
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Vector Boson Fusion Signatures of Superheavy Majorana Neutrinos at Muon Colliders
Future muon colliders could probe heavy Majorana neutrino masses via t-channel vector boson fusion, with projected exclusions in the (mass, mixing) plane from cut-based and BDT analyses.
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