Extended Higgs sectors, effective field theory and Higgs phenomenology

Abstract

We consider the phenomenological implications of charged scalar extensions of the SM Higgs sector in addition to EFT couplings of this new state to SM matter. We perform a detailed investigation of modifications of loop-induced decays of the 125 GeV Higgs boson, which receives corrections from the propagating charged scalars alongside one-loop EFT operator insertions and demonstrate that the interplay of $H\to \gamma \gamma$ and $H\to Z\gamma$ decays can be used to clarify the additional states phenomenology in case a discovery is made in the future. In parallel, EFT interactions of the charged Higgs can lead to a decreased sensitivity to the virtual presence of charged Higgs states, which can significantly weaken the constraints that are naively expected from the precisely measured $H\to \gamma \gamma$ branching ratio. Again $H\to Z\gamma$ measurements provide complementary sensitivity that can be exploited in the future.

11 pages, 6 captioned figures, 4 tables

References in corpus (7)

• 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
• Effective Theories and Measurements at Colliders
• A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• The decay $h\to Z\gamma$ in the Standard-Model Effective Field Theory
• Perturbative Higgs CP violation, unitarity and phenomenology
• Same-sign W pair production in composite Higgs models

Cited by in corpus (3)

• SmeftFR v3 -- Feynman rules generator for the Standard Model Effective Field Theory
• Resurrecting the LHC discovery potential in the extended Type-II Seesaw Model
• Compact representation for electroweak lepton sector