Gravitons in multiply warped scenarios - at 750 GeV and beyond

TL;DR

This paper explores a 6-dimensional warped compactification model to address fine tuning issues in extra dimension theories, analyzing constraints from LHC data and potential signals at higher energies, including the 750 GeV diphoton excess.

Contribution

It introduces a 6D warped scenario that alleviates fine tuning and investigates its phenomenology, including compatibility with recent LHC excesses and constraints.

Findings

Parameter space consistent with 13 TeV diphoton excess.

Constraints from 8 TeV LHC data on the model.

Potential signals at 14 TeV LHC run.

Abstract

The search for extra dimensions has so far yielded no positive results at the LHC. Along with the discovery of a 125 GeV Higgs boson, this implies a moderate degree of fine tuning in the parameter space of the Randall-Sundrum model. Within a 6-dimensional warped compactification scenario, with its own interesting phenomenological consequences, the parameters associated with the additional spatial direction can be used to eliminate the need for fine tuning. We examine the constraints on this model due to the 8 TeV LHC data and survey the parameter space that could be probed at the 14 TeV run of the LHC. We also identify the region of parameter space that is consistent with the recently reported excess in the diphoton channel in the 13 TeV data. Finally, as an alternative explanation for the observed excess, we discuss a scenario with brane-localized Einstein-Hilbert terms with Standard Model fields in the bulk.