Singlet Model Interference Effects with High Scale UV Physics

Abstract

One of the simplest extensions of the Standard Model (SM) is the addition of a scalar gauge singlet, S. If S is not forbidden by a symmetry from mixing with the Standard Model Higgs boson, the mixing will generate non-SM rates for Higgs production and decays. In general, there could also be unknown high energy physics that generates additional effective low energy interactions. We show that interference effects between the scalar resonance of the singlet model and the effective field theory (EFT) operators can have significant effects in the Higgs sector. We examine a non-$Z_2$ symmetric scalar singlet model and demonstrate that a fit to the 125 GeV Higgs boson couplings and to limits on high mass resonances, S, exhibit an interesting structure and possible large cancellations of effects between the resonance contribution and the new EFT interactions, that invalidate conclusions based on the renormalizable singlet model alone.

18 pages, 7 figures; revised to emphasize the points of general interest for heavy resonance searches at the LHC

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Cited by in corpus (8)

• Higgs boson potential at colliders: status and perspectives
• Probing Electroweak Phase Transition via Enhanced Di-Higgs Production
• Interpreting the 750 GeV digamma excess: a review
• Beyond the Standard Model Effective Field Theory: The Singlet Extended Standard Model
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Interference effects in resonant di-Higgs production at the LHC in the Higgs singlet extension
• Uncovering the relation of a scalar resonance to the Higgs boson
• Learning from the New Higgs-like Scalar before It Vanishes