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Title: A 750 GeV portal: LHC phenomenology and dark matter candidates

We study the effective field theory obtained by extending the Standard Model field content with two singlets: a 750 GeV (pseudo-)scalar and a stable fermion. Accounting for collider productions initiated by both gluon and photon fusion, we investigate where the theory is consistent with both the LHC diphoton excess and bounds from Run 1. We analyze dark matter phenomenology in such regions, including relic density constraints as well as collider, direct, and indirect bounds. Scalar portal dark matter models are very close to limits from direct detection and mono-jet searches if gluon fusion dominates, and not constrained at all otherwise. In conclusion, pseudo-scalar models are challenged by photon line limits and mono-jet searches in most of the parameter space.
 [1] ;  [2] ;  [3]
  1. Univ. of California Santa Cruz, Santa Cruz, CA (United States); Santa Cruz Institute for Particle Physics, Santa Cruz, CA (United States)
  2. Nikhef, Amsterdam (The Netherlands)
  3. Univ. Pierre et Marie Curie, Paris (France)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 5; Journal ID: ISSN 1029-8479
Springer Berlin
Research Org:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Org:
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Beyond Standard Mode; cosmology of theories beyond the SM