Light (and darkness) from a light hidden Higgs
May 4, 2018
11 pages
Published in:
- JHEP 06 (2018) 137
- Published: Jun 25, 2018
e-Print:
- 1805.01970 [hep-ph]
Report number:
- UG-FT-327-18,
- CAFPE-197-18,
- UG-FT 327/18,
- CAFPE 197/18,
- SMU-HEP-18-08,
- FERMILAB-PUB-18-159-T
Citations per year
Abstract: (Springer)
We examine light diphoton signals from extended Higgs sectors possessing (approximate) fermiophobia with Standard Model (SM) fermions as well as custodial symmetry. This class of Higgs sectors can be realized in various beyond the SM scenarios and is able to evade many experimental limits, even at light masses, which are otherwise strongly constraining. Below the WW threshold, the most robust probes of the neutral component are di and multi-photon searches. Utilizing the dominant Drell-Yan Higgs pair production mechanism and combining it with updated LHC diphoton data, we derive robust upper bounds on the allowed branching ratio for masses between 45 − 160 GeV. Furthermore, masses ≲ 110 GeV are ruled out if the coupling to photons is dominated by W boson loops. We then examine two simple ways to evade these bounds via cancellations between different loop contributions or by introducing decays into an invisible sector. This also opens up the possibility of future LHC diphoton signals from a light hidden Higgs sector. As explicit realizations, we consider the Georgi-Machacek (GM) and Supersymmetric GM (SGM) models which contain custodial (degenerate) Higgs bosons with suppressed couplings to SM fermions and, in the SGM model, a (neutralino) LSP. We also breifly examine the recent ∼ 3σ CMS diphoton excess at ∼ 95 GeV.Note:
- references added, typos corrected, version to be published
- Beyond Standard Model
- Extended Supersymmetry
- new physics
- symmetry: custodial
- two-photon
- CERN LHC Coll
- Drell-Yan process
- Higgs particle: pair production
- branching ratio
- Higgs particle
References(124)
Figures(4)