Lepton flavor physics at ${\mu }^{+}{\mu }^{+}$ colliders

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 $\mathcal{L}=1$ 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.

arXiv comment20 pages, 7 figures

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Cited by in corpus (5)

• Neutrino mass models at $\mu$TRISTAN
• Testing tree level TeV scale seesaw scenarios in $\mu$TRISTAN
• Precision Higgs Boson Probe of Type-II Seesaw Models
• Investigation of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall- Sundrum model
• Seesaw Models under the Lens of Angular Distributions at ${\mu }^{+}{\mu }^{-},{\mu }^{+}{\mu }^{+},{\mu }^{+}\gamma$ and ${\mu }^{+}{e}^{-}$ Colliders