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arXiv · 1601.00624

Heavy photophilic scalar at the LHC from a varying electromagnetic coupling

Ulf Danielsson·Rikard Enberg·Gunnar Ingelman·Tanumoy Mandal
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Abstract

We investigate the phenomenology of a heavy scalar $ϕ$ of the type involved in Bekenstein's framework for varying electromagnetic coupling theories, with the difference that the scalar in our model has a large mass. The model has only two free parameters, the mass $M_ϕ$ of the scalar and the scale $Λ$ of new physics. The scalar is dominantly produced through photon-photon fusion at the LHC and leads to a diphoton final state. It can also be produced by quark-antiquark fusion in association with a photon or a fermion pair. Its dominating decay is to diphotons, but it also has a large three-body branching to a fermion pair and a photon, which can provide an interesting search channel with a dilepton-photon resonance. We derive exclusion limits on the $M_ϕ-Λ$ plane from the latest 13 TeV LHC diphoton resonance search data. For a benchmark mass of $M_ϕ\sim 1$ TeV, we find a lower limit on $Λ$ of 18 TeV. We discuss the more complex possibility of varying couplings in the full electroweak theory and comment on the possibility that the new physics is related to extra dimensions or string theory.

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Ulf Danielsson, Rikard Enberg, Gunnar Ingelman, Tanumoy Mandal. 2017-02-17. Heavy photophilic scalar at the LHC from a varying electromagnetic coupling. https://doi.org/10.1016/j.nuclphysb.2017.04.003

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