Search for high mass dilepton resonances in pp collisions at sqrt{s}=7 TeV with the ATLAS experiment

TL;DR

This paper reports a search for high mass dilepton resonances at the LHC using ATLAS data, setting new mass limits on hypothetical Z' bosons with no significant excess observed.

Contribution

First search for high mass dilepton resonances at 7 TeV with ATLAS, establishing new mass exclusion limits on Z' models.

Findings

No significant excess above Standard Model expectations.

Lower mass limit of 1.048 TeV on Z' boson.

Set of mass limits on various Z' models.

Abstract

This article presents a search for high mass e e or mu mu resonances in pp collisions at sqrt{s} = 7 TeV at the LHC. The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated luminosity of ~40/pb. No statistically significant excess above the Standard Model expectation is observed in the search region of dilepton invariant mass above 110 GeV. Upper limits at the 95% confidence level are set on the cross section times branching ratio of Z' resonances decaying to dielectrons and dimuons as a function of the resonance mass. A lower mass limit of 1.048 TeV on the Sequential Standard Model Z' boson is derived, as well as mass limits on Z* and E(6)-motivated Z' models.