Diphoton excess at 750 GeV in an extended scalar sector

TL;DR

This paper proposes an extended scalar sector model to explain the 750 GeV diphoton excess observed at LHC Run II, involving a singlet scalar coupled to top quarks and charged scalars.

Contribution

It introduces a novel scalar sector extension with a singlet scalar and charged scalars, explaining the diphoton excess without conflicting with previous data or theoretical constraints.

Findings

The model accounts for the 750 GeV diphoton excess.

It remains consistent with LHC Run I data.

It satisfies perturbative unitarity and charge conservation.

Abstract

We discuss an extended scalar model which explains the recent results of diphoton excess at 750 GeV at LHC Run II experiments. An additional singlet scalar boson with the mass of 750 GeV, which couples to top quarks via a dimension five operator, is produced via gluon fusion and decays into two photons via loop contributions of a number of (multiply) charged scalar bosons. Origin of such a dimension five operator would be, for example, in the context of composite Higgs models. The excess can be explained without contradicting the data from LHC Run I and also theoretical consistencies such as perturbative unitarity and charge non-breaking.