Di-photon excess illuminates dark matter

Backović, Mihailo (Center for Cosmology, Particle Physics and Phenomenology — CP3, Universite Catholique de Louvain, Louvain-la-neuve, Belgium) ; Mariotti, Alberto (Theoretische Natuurkunde and IIHE/ELEM, Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussels, Belgium) (International Solvay Institutes, Pleinlaan 2, B-1050, Brussels, Belgium) ; Redigolo, Diego (Laboratoire de Physique Théorique et Hautes Energies, CNRS UMR 7589, Universiteé Pierre et Marie Curie, 4 place Jussieu, F-75005, Paris, France)

23 March 2016

Abstract: We propose a simplified model of dark matter with a scalar mediator to accommodate the di-photon excess recently observed by the ATLAS and CMS collaborations. Decays of the resonance into dark matter can easily account for a relatively large width of the scalar resonance, while the magnitude of the total width combined with the constraint on dark matter relic density leads to sharp predictions on the parameters of the Dark Sector. Under the assumption of a rather large width, the model predicts a signal consistent with ∼ 300 GeV dark matter particle and ∼ 750 GeV scalar mediator in channels with large missing energy. This prediction is not yet severely bounded by LHC Run I searches and will be accessible at the LHC Run II in the jet plus missing energy channel with more luminosity. Our analysis also considers astro-physical constraints, pointing out that future direct detection experiments will be sensitive to this scenario.


Published in: JHEP 1603 (2016) 157
Published by: Springer/SISSA
DOI: 10.1007/JHEP03(2016)157
arXiv: 1512.04917
License: CC-BY-4.0



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