Singlet model interference effects with high scale UV physics

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...

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Bibliographic Details
Published in:Physical review. D 2017, Vol.95 (1), Article 015004
Main Authors: Dawson, S., Lewis, I. M.
Format: Article
Language:English
Subjects:
Couplings
EFT
Field theory
GeV
HEP
Higgs
Higgs bosons
Interference
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Quarks
scalar
SM
Standard model (particle physics)
Symmetry
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Summary: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-Z2 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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.95.015004