Universal Doublet-Singlet Higgs Couplings and phenomenology at the CERN Large Hadron Collider

Abstract

We consider a minimal extension of the standard model where a real, gauge singlet scalar field is added to the standard spectrum. Introducing the Ansatz of universality of scalar couplings, we are led to a scenario which has a set of very distinctive and testable predictions: (i) the mixing between the standard model Higgs and the new state is near maximal, (ii) the ratio of the two Higgs mass eigenstates is fixed ($\sim \sqrt{3}$), (iii) the decay modes of each of the two eigenstates are standard model like. We also study how electroweak precision tests constrain this scenario. We predict the lighter Higgs to lie in the range of 114 and 145 GeV, and hence the heavier one between 198 and 250 GeV. The predictions of the model can be tested at the upcoming LHC.

5 pages, no figures; v2: normalisations settled, results unchanged, References added; v3: a new section 'Deviation from universality' added, version to appear in Phys Rev D (Brief Reports section)

References in corpus (6)

• Gauge Singlet Scalars as Cold Dark Matter
• Echoes of a Hidden Valley at Hadron Colliders
• LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
• Singlet Higgs Phenomenology and the Electroweak Phase Transition
• Higgs-field Portal into Hidden Sectors
• The minimal non-minimal standard model

Cited by in corpus (9)

• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Heavy Dark Matter Through the Higgs Portal
• Delta r and the W-boson mass in the Singlet Extension of the Standard Model
• Probing Hidden Sector Photons through the Higgs Window
• Hiding the Higgs Boson with Multiple Scalars
• Phenomenology of the minimal B-L extension of the Standard Model at the LHC
• New signals for singlet Higgs and vector-like quarks at the LHC
• Higgs interference effects at the one-loop level in the 1-Higgs-Singlet extension of the Standard Model
• Higgs interference effects in top-quark pair production in the 1HSM