CP-violating Higgs Di-tau Decays: Baryogenesis and Higgs Factories

Abstract

We demonstrate how probes of CP-violating observables in Higgs di-tau decays at prospective future lepton colliders could provide a test of weak scale baryogenesis with significant discovery potential. Measurements at the Circular Electron Positron Collider, for example, could exclude a CP phase larger than $2.9^{\circ }$ ($5.6^{\circ }$) at 68% (95%) C.L. assuming the Standard Model value for magnitude of the tau lepton Yukawa coupling. Conversely, this sensitivity would allow for a $5\sigma$ discovery for 82% of the CP phase range $[0,2\pi )$. The reaches of the Future Circular Collider - ee and International Linear Collider are comparable. As a consequence, future lepton colliders could establish the presence of CP violation required by lepton flavored electroweak baryogenesis with at least $3\sigma$ sensitivity. Our results illustrate that Higgs factories are not just precision machines but can also make $\mathcal{O}(1)$ measurement of the new physics beyond the Standard Model.

arXiv comment22 pages, 6 figures

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