Search for extra dimensions in the diphoton final state with ATLAS

TL;DR

This paper reports a search for evidence of extra spatial dimensions using diphoton data from the ATLAS detector at the LHC, finding no deviations from the Standard Model and setting limits on theoretical models.

Contribution

First search for extra dimensions in diphoton final states at 7 TeV with ATLAS, establishing new lower limits on model parameters.

Findings

Diphoton spectrum agrees with Standard Model predictions.

Set 95% confidence level lower limits on Planck scale and Kaluza-Klein excitation mass.

No evidence found for extra dimensions in the analyzed data.

Abstract

The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, has been addressed in some models through the existence of extra spatial dimensions. A search for evidence of extra spatial dimensions has been performed, through an analysis of the diphoton final state in data recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. The analysis uses a dataset of 2.12 fb-1 of proton-proton collisions at sqrts=7 TeV. The diphoton invariant mass spectrum is observed to be in good agreement with the expected Standard Model (SM) background. We set 95 CL lower limits on the fundamental Planck scale in the context of the Arkani-Hamed, Dimopoulos, Dvali model (ADD) and on the lightest Kaluza Klein (KK) excitation mass in the context of the Randall-Sundrum model (RS).