The 750 GeV threshold to a new particle world

Abstract

We show how an excess in the diphoton channel can be the effect of neither a resonance nor an end-point in a cascade decay, but rather of a threshold for virtual production of a pair of extra quarks, each with half of peak invariant mass, onsetting in both the $gg$-initiated production and the $\gamma \gamma$-induced decay of an off-shell $Z$ boson. For our analysis we consider as paradigmatic example the 750 GeV excess previously seen at the end of 2015 with the Run 2 data of the LHC but not confirmed with 2016 data.

6 pages, 5 figures, 2 tables, version accepted by PRD

References in corpus (6)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Threshold enhancement of diphoton resonances
• Variations on a Higgs theme
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Cited by in corpus (2)

• Interpreting the 750 GeV digamma excess: a review
• Phenomenology of 2HDM with VLQs