Probing flavor nonuniversal theories through Higgs physics at the LHC and future colliders

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 Higgsstrah...

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Bibliographic Details
Published in:Physical review. D 2020-02, Vol.101 (3), Article 035045
Main Authors: Chiu, Wen Han, Liu, Zhen, Wang, Lian-Tao
Format: Article
Language:English
Subjects:
Coupling
Flavor (particle physics)
Higgs bosons
Neutral currents
Operators
Physics
Quarks
Sensitivity
Uncertainty
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Summary: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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.101.035045