Enhancement of $h\to \gamma \gamma$ by seesaw-motivated exotic scalars

Abstract

We examine the role of seesaw motivated exotic scalars in loop-mediated Higgs decays. We consider a simple TeV-scale seesaw model built upon the fermionic quintuplet mediator in conjunction with the scalar quadruplet, where we examine portions of the model parameter space for which the contributions of charged components of the scalar quadruplet significantly increase the $h\to \gamma \gamma$ decay rate. The most significant change in the diphoton width comes from a doubly charged scalar Φ^{--} which should be the lightest component in the scalar quadruplet. There is a mild suppression of the $h\to Z\gamma$ decay width by a factor 0.9 -- 0.7 in the part of the parameter space where the $h\to \gamma \gamma$ decay width is enhanced by a factor 1.25 -- 2.

12 pages, 3 figures, corresponds to published version

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
• A search for a doubly-charged Higgs boson in pp collisions at sqrt(s) = 7 TeV
• Vacuum Stability, Perturbativity, EWPD and Higgs-to-diphoton rate in Type II Seesaw Models
• New Mechanism for Neutrino Mass Generation and Triply Charged Higgs Bosons at the LHC
• TeV-scale Seesaw with Quintuplet Fermions
• Higgs boson decays to $\gamma \gamma$ and $Z\gamma$ in models with Higgs extensions
• The apparent excess in the Higgs to di-photon rate at the LHC: New Physics or QCD uncertainties?
• Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification

Cited by in corpus (6)

• From the trees to the forest: a review of radiative neutrino mass models
• A Model of Radiative Neutrino Mass: with or without Dark Matter
• A Class of Three-Loop Models with Neutrino Mass and Dark Matter
• Minimal Radiative Neutrino Masses
• Lepton-number-violating decays of heavy flavors induced by doubly-charged Higgs boson
• Left-right supersymmetry after the Higgs boson discovery