Search for high-mass resonances decaying to dilepton final states in pp collisions at a center-of-mass energy of 7 TeV with the ATLAS detector

TL;DR

This paper reports a search for high-mass resonances decaying into dilepton pairs at 7 TeV using the ATLAS detector, setting mass exclusion limits on various theoretical particles like Z' bosons and gravitons.

Contribution

First search at 7 TeV for high-mass dilepton resonances with new exclusion limits on several beyond Standard Model particles.

Findings

Excluded Z' bosons below 2.22 TeV

Excluded Randall-Sundrum gravitons below 2.16 TeV

Set limits on Technicolor and Z' models

Abstract

The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z' gauge bosons, Randall-Sundrum gravitons, Z* bosons, techni-mesons, Kaluza-Klein Z/gamma bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9/fb in the dielectron channel and 5.0/fb in the dimuon channel. A Z' boson with Standard Model-like couplings is excluded at 95 percent confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling k/Mbar = 0.1 is excluded at 95 percent confidence level for masses below 2.16 TeV. Limits on the other models are also presented, including Technicolor and Minimal Z' Models.