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Title: Light (and darkness) from a light hidden Higgs

Here, 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 $$\lesssim 110$$ 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 $$\sim 3\sigma$$ CMS diphoton excess at $$\sim 95$$ GeV.
Authors:
 [1] ;  [2] ;  [1]
  1. Southern Methodist Univ., Dallas, TX (United States)
  2. Univ. de Granada, Granada (Spain)
Publication Date:
Report Number(s):
UG-FT-327-18; CAFPE-197-18; SMU-HEP-18-08; FERMILAB-PUB-18-159-T; arXiv:1805.01970
Journal ID: ISSN 1029-8479; 1672008
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Extended Supersymmetry
OSTI Identifier:
1457539

Vega, Roberto, Vega-Morales, Roberto, and Xie, Keping. Light (and darkness) from a light hidden Higgs. United States: N. p., Web. doi:10.1007/JHEP06(2018)137.
Vega, Roberto, Vega-Morales, Roberto, & Xie, Keping. Light (and darkness) from a light hidden Higgs. United States. doi:10.1007/JHEP06(2018)137.
Vega, Roberto, Vega-Morales, Roberto, and Xie, Keping. 2018. "Light (and darkness) from a light hidden Higgs". United States. doi:10.1007/JHEP06(2018)137. https://www.osti.gov/servlets/purl/1457539.
@article{osti_1457539,
title = {Light (and darkness) from a light hidden Higgs},
author = {Vega, Roberto and Vega-Morales, Roberto and Xie, Keping},
abstractNote = {Here, 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 $\lesssim 110$ 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 $\sim 3\sigma$ CMS diphoton excess at $\sim 95$ GeV.},
doi = {10.1007/JHEP06(2018)137},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2018,
place = {United States},
year = {2018},
month = {6}
}