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

Mar 19, 2014
23 pages
Published in:
  • Phys.Rev.D 89 (2014) 11, 115003
  • Published: Jun 3, 2014
e-Print:
Report number:
  • SCIPP-14-02,
  • UCD-2014-2

Citations per year

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Abstract: (APS)

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).

Note:
  • 28 pages, 21 figures
  • 14.80.Ec
  • 12.60.-i
  • 12.60.Fr
  • new physics
  • Higgs model
  • CERN LHC Coll
  • p p: scattering
  • electron positron: linear collider
  • electron positron: scattering
  • Higgs particle: doublet: 2