We explored the possibility that Higgs coupling to new physics violates flavor universality. In particular, we parametrize such models with dimension-six effective operators which modify the coupling between the first generation quarks, Higgs boson, and Z boson. Through the use of boosted Higgsstrahlung events at both the HL-LHC and potential future hadron colliders, as well as existing ATLAS data for background estimates, we projected constraints on the scale of new physics as a function of the Wilson coefficient. The high energy Zh process will provide unique information about these class of operators, and the sensitivity is competitive with the LEP electroweak precision measurements. We include different scenarios of the overall systematic uncertainties and the PDF uncertainties when presenting the projected sensitivities. We also discuss the constraints from flavor changing neutral currents to these flavor-violating models and the complementarity of the exotic Higgs decay to the Zh process.
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The authors would like to thank Emmanuel Stamou and Da Liu for helpful discussions. Z. L. and L. T. W. would like to thank Aspen Center for Physics (Grant No. PHY-1607611), KITP, Institute for High Energy Physics (IHEP), KAIST, and Munich Institute for Astro- and Particle Physics (MIAPP) physics programs for support and providing the environment for collaboration during various stages of this work. Z. L. is supported in part by the NSF under Grant No. PHY1620074 and by the Maryland Center for Fundamental Physics. L. T. W. is supported by the DOE Grant No. DE-SC0013642.
© 2020 authors.