Search for a heavy narrow resonance decaying to e mu, e tau, or mu tau with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC

TL;DR

This paper reports a search for heavy particles decaying into different lepton pairs using ATLAS data at 7 TeV, finding no evidence of new physics but setting new limits on certain supersymmetric particles.

Contribution

First search for heavy resonances decaying into e mu, e tau, or mu tau final states at the LHC with ATLAS, extending previous experimental constraints.

Findings

No significant excess observed above Standard Model expectations.

Set 95% CL limits on R-parity-violating tau sneutrino production.

Results extend constraints beyond previous Tevatron experiments.

Abstract

This letter presents the results of a search for a heavy particle decaying into an e mu, e tau, or mu tau final state in pp collisions at sqrt(s) = 7 TeV. The data were recorded with the ATLAS detector at the LHC during 2011 and correspond to an integrated luminosity of 4.6/fb. No significant excess above the Standard Model expectation is observed, and exclusions at 95% confidence level are placed on the cross section times branching ratio for the production of an R-parity-violating supersymmetric tau sneutrino. These results considerably extend constraints from Tevatron experiments.