Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider

TL;DR

This study searches for evidence of large extra dimensions through diphoton events at the LHC, setting new lower bounds on the effective Planck scale, with no observed excess over standard model predictions.

Contribution

It provides the first limits on large extra dimensions using diphoton final states at 7 TeV with CMS data, improving constraints on models with multiple extra dimensions.

Findings

No excess events observed above standard model expectations.

Set new lower limits on the effective Planck scale (1.6-2.3 TeV).

Most restrictive bounds to date on models with more than two large extra dimensions.

Abstract

A search for large extra spatial dimensions via virtual-graviton exchange in the diphoton channel has been carried out with the CMS detector at the LHC. No excess of events above the standard model expectations is found using a data sample collected in proton-proton collisions at sqrt(s) = 7 TeV and corresponding to an integrated luminosity of 36 inverse picobarns. New lower limits on the effective Planck scale in the range of 1.6-2.3 TeV at the 95% confidence level are set, providing the most restrictive bounds to date on models with more than two large extra dimensions.