Probing extra Yukawa couplings by precision measurements of Higgs boson properties

Probing extra Yukawa couplings by precision measurements of Higgs boson properties If one removes any ad hoc symmetry assumptions, the general two-Higgs-doublet model should have additional Yukawa interactions independent from fermion mass generation, in general involving flavor-changing neutral Higgs couplings. These extra couplings can affect the discovered Higgs boson h through fermion loop contributions. We calculate the renormalized hZZ coupling at the one-loop level and evaluate the dependence on heavy Higgs boson mass and extra Yukawa coupling ρtt. Precision measurements at future colliders can explore the parameter space, and can give stronger bounds on ρtt than the current bound from flavor experiments. As a side result, we find that if ρttcosγ<0, where cosγ is the exotic Higgs component of h, the ρtt-induced top loop contribution cancels against bosonic loop contributions, and one may have alignment without decoupling, namely sin(-γ)≃1, but exotic scalar bosons could have masses of several hundred GeV. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Probing extra Yukawa couplings by precision measurements of Higgs boson properties

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Probing extra Yukawa couplings by precision measurements of Higgs boson properties

Abstract

If one removes any ad hoc symmetry assumptions, the general two-Higgs-doublet model should have additional Yukawa interactions independent from fermion mass generation, in general involving flavor-changing neutral Higgs couplings. These extra couplings can affect the discovered Higgs boson h through fermion loop contributions. We calculate the renormalized hZZ coupling at the one-loop level and evaluate the dependence on heavy Higgs boson mass and extra Yukawa coupling ρtt. Precision measurements at future colliders can explore the parameter space, and can give stronger bounds on ρtt than the current bound from flavor experiments. As a side result, we find that if ρttcosγ<0, where cosγ is the exotic Higgs component of h, the ρtt-induced top loop contribution cancels against bosonic loop contributions, and one may have alignment without decoupling, namely sin(-γ)≃1, but exotic scalar bosons could have masses of several hundred GeV.
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Publisher
American Physical Society (APS)
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.015033
Publisher site
See Article on Publisher Site

Abstract

If one removes any ad hoc symmetry assumptions, the general two-Higgs-doublet model should have additional Yukawa interactions independent from fermion mass generation, in general involving flavor-changing neutral Higgs couplings. These extra couplings can affect the discovered Higgs boson h through fermion loop contributions. We calculate the renormalized hZZ coupling at the one-loop level and evaluate the dependence on heavy Higgs boson mass and extra Yukawa coupling ρtt. Precision measurements at future colliders can explore the parameter space, and can give stronger bounds on ρtt than the current bound from flavor experiments. As a side result, we find that if ρttcosγ<0, where cosγ is the exotic Higgs component of h, the ρtt-induced top loop contribution cancels against bosonic loop contributions, and one may have alignment without decoupling, namely sin(-γ)≃1, but exotic scalar bosons could have masses of several hundred GeV.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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