A Search for Heavy Resonances in the Dilepton Channel

TL;DR

This paper reports on a search for new high-mass resonances like Z' and gravitons in dilepton channels using ATLAS data from the LHC at 7 TeV, aiming to find evidence of physics beyond the Standard Model.

Contribution

It presents the first search for heavy resonances in dilepton channels at 7 TeV with the ATLAS detector, focusing on potential signals of new physics such as extra U(1) symmetries or extra dimensions.

Findings

No significant excess observed over Standard Model predictions.

Set limits on the production cross-section of hypothetical resonances.

Constrained parameter space for models predicting Z' and Randall-Sundrum gravitons.

Abstract

There are many extensions to the Standard Model of particle physics which predict the addition of a U(1) symmetry, and/or extra spatial dimensions, which give rise to new high mass resonances such as the Z' and Randall-Sundrum graviton. The LHC provides a unique opportunity to explore the TeV scale where these phenomena may become apparent, and can be searched for using the precision tracking and high energy resolution calorimetry of the ATLAS detector. This poster presents the search for high mass resonances in the dilepton channel, and was conducted with an integrated luminosity of 1.08/1.21 fb-1 in the dielectron/dimuon channel respectively, at a centre of mass energy \surd s = 7 TeV.