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Probing wrong-sign Yukawa couplings at the LHC and a future linear collider

P. M. Ferreira* and Rui Santos†

John F. Gunion‡

Howard E. Haber§

  • Instituto Superior de Engenharia de Lisboa-ISEL, 1959-007 Lisboa, Portugal and Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, Avenida Professor Gama Pinto 2, 1649-003 Lisboa, Portugal

  • Davis Institute for High Energy Physics, University of California, Davis, California 95616, USA

  • Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064, USA and Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

  • *ferreira@cii.fc.ul.pt
  • †rsantos@cii.fc.ul.pt
  • ‡gunion@physics.ucdavis.edu
  • §haber@scipp.ucsc.edu
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Phys. Rev. D 89, 115003 – Published 3 June, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.115003

Abstract

We consider the two-Higgs-doublet model as a framework in which to evaluate the viability of scenarios in which the sign of the coupling of the observed Higgs boson to down-type fermions (in particular, b-quark pairs) is opposite to that of the Standard Model (SM), while at the same time all other tree-level couplings are close to the SM values. We show that, whereas such a scenario is consistent with current LHC observations, both future running at the LHC and a future e+e− linear collider could determine the sign of the Higgs coupling to b-quark pairs. Discrimination is possible for two reasons. First, the interference between the b-quark and the t-quark loop contributions to the ggh coupling changes sign. Second, the charged-Higgs loop contribution to the γγh coupling is large and fairly constant up to the largest charged-Higgs mass allowed by tree-level unitarity bounds when the b-quark Yukawa coupling has the opposite sign from that of the SM (the change in sign of the interference terms between the b-quark loop and the W and t loops having negligible impact).

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Phys. Rev. D 89, 115003– Published 3 June, 2014
  • Received 26 March 2014

© 2014 American Physical Society

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