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Title: Modification of Higgs couplings in minimal composite models

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Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
FG02-13ER41958; SC0009924
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 3; Related Information: CHORUS Timestamp: 2017-08-17 16:54:00; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Liu, Da, Low, Ian, and Wagner, Carlos E. M. Modification of Higgs couplings in minimal composite models. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.035013.
Liu, Da, Low, Ian, & Wagner, Carlos E. M. Modification of Higgs couplings in minimal composite models. United States. doi:10.1103/PhysRevD.96.035013.
Liu, Da, Low, Ian, and Wagner, Carlos E. M. 2017. "Modification of Higgs couplings in minimal composite models". United States. doi:10.1103/PhysRevD.96.035013.
title = {Modification of Higgs couplings in minimal composite models},
author = {Liu, Da and Low, Ian and Wagner, Carlos E. M.},
abstractNote = {},
doi = {10.1103/PhysRevD.96.035013},
journal = {Physical Review D},
number = 3,
volume = 96,
place = {United States},
year = 2017,
month = 8

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on August 17, 2018
Publisher's Accepted Manuscript

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  • We consider composite Higgs models where the Higgs is a pseudo-Nambu Goldstone boson arising from the spontaneous breaking of an approximate global symmetry by some underlying strong dynamics. We focus on the SO(5) → SO(4) symmetry breaking pattern, assuming the “partial compositeness” paradigm. We study the consequences on Higgs physics of the fermionic representations produced by the strong dynamics, that mix with the Standard Model (SM) degrees of freedom. We consider models based on the lowest-dimensional representations of SO(5) that allow for the custodial protection of the Z b ¯ b coupling, i.e. the 5, 10 and 14. We findmore » a generic suppression of the gluon fusion process, while the Higgs branching fractions can be enhanced or suppressed compared to the SM. Interestingly, a precise measurement of the Higgs boson couplings can distinguish between different realizations in the fermionic sector, thus providing crucial information about the nature of the UV dynamics.« less
  • We address electroweak baryogenesis in the context of composite Higgs models, pointing out that modifications to the Higgs and top quark sectors can play an important rôle in generating the baryon asymmetry. Our main observation is that composite Higgs models that include a light, gauge singlet scalar in the spectrum [as in the model based on the symmetry breaking pattern SO(6) → SO(5)], provide all necessary ingredients for viable baryogenesis. In particular, the singlet leads to a strongly first-order electroweak phase transition and introduces new sources of CP violation in dimension-five operators involving the top quark. We discuss the amountmore » of baryon asymmetry produced and the experimental constraints on the model.« less
  • Within the minimal supersymmetric standard model, four self-couplings, {lambda}{sub hhh}, {lambda}{sub hhH}, {lambda}{sub hHH}, and {lambda}{sub HHH}, and the decay rate {gamma}(H {sup {yields}} hh) are calculated with allowance for one-loop corrections induced by the contribution of the t, b, and c quarks, the {tau} lepton, and the corresponding superpartners and with the aid of the on-shell renormalization scheme. An analysis of the dependences of these features on tan{beta} and the mass of the A Higgs boson, M{sub A}, shows that, in a specific region of the model-parameter space, the calculated corrections can make a significant contribution to the couplingsmore » and decay rate in the one-loop approximation. The inclusion of the radiative corrections in question is mandatory in reconstructing the Higgs potential.« less
  • Extra vectorlike matter with both electroweak-singlet masses and large Yukawa couplings can significantly raise the lightest Higgs boson mass in supersymmetry through radiative corrections. I consider models of this type that involve a large Yukawa coupling between weak isotriplet and isodoublet chiral supermultiplets. The particle content can be completed to provide perturbative gauge coupling unification, in several different ways. The impact on precision electroweak observables is shown to be acceptably small, even if the new particles are as light as the current experimental bounds of order 100 GeV. I study the corrections to the lightest Higgs boson mass, and discussmore » the general features of the collider signatures for the new fermions in these models.« less
  • Completely natural electroweak symmetry breaking is easily achieved in supersymmetric models if there is a SM-like Higgs boson, h, with m{sub h} < or approx. 100 GeV. In the minimal supersymmetric model, such an h decays mainly to bb and is ruled out by LEP constraints. However, if the MSSM Higgs sector is expanded so that h decays mainly to still lighter Higgs bosons, e.g. h{yields}aa, with Br(h{yields}aa)>0.7, and if m{sub a}<2m{sub b}, then the LEP constraints are satisfied even if m{sub h} < or approx. 100 GeV. In this paper, we show that in the next-to-minimal supersymmetric model themore » above h and a properties (for the lightest CP-even and CP-odd Higgs bosons, respectively) imply a lower bound on Br({upsilon}{yields}{gamma}a) that dedicated runs at present (and future) B factories can explore.« less