Bulk Higgs and the 750 GeV diphoton signal

TL;DR

This paper proposes a warped extra-dimensional model with a bulk Higgs that naturally explains the 750 GeV diphoton excess observed at the LHC, linking it to the lightest CP odd Higgs excitation without introducing new matter.

Contribution

It introduces a 5D bulk Higgs model with brane localized kinetic terms that accounts for the 750 GeV diphoton signal as a CP odd Higgs excitation, connecting it to extra-dimensional physics.

Findings

The 750 GeV resonance can be explained as the lightest CP odd Higgs in the model.

The model fits the observed diphoton signal with a TeV-scale spectrum of resonances.

No additional matter fields are needed beyond the bulk Higgs and standard model content.

Abstract

We consider scenarios of warped extra-dimensions with all matter fields in the bulk and in which both the hierarchy and the flavor puzzles of the Standard Model are addressed. The simplest extra dimensional extension of the Standard Model Higgs sector, i.e a 5D bulk Higgs doublet, can be a natural and simple explanation to the 750 GeV excess of diphotons hinted at the LHC, with the resonance responsible for the signal being the lightest CP odd excitation coming from the Higgs sector. No new matter content is invoked, the only new ingredient being the presence of (positive) brane localized kinetic terms associated to the 5D bulk Higgs, which allow to reduce the mass of the lightest CP odd Higgs excitation to 750 GeV. Production and decay of this resonance can naturally fit the observed signal when the mass scale of the rest of extradimensional resonances is of order 1 TeV.