Search for a heavy neutral particle decaying into an electron and a muon using 1 fb^-1 of ATLAS data

TL;DR

This paper reports a search for a heavy neutral particle decaying into an electron and muon using ATLAS data, setting limits on new physics models due to no observed excess.

Contribution

First search for a neutral particle decaying to emu final state at 7 TeV with 1.07 fb^-1 of data, constraining new physics models.

Findings

No excess observed over Standard Model background

Set 95% CL upper limits on tau sneutrino production

Set 95% CL upper limits on Z'-like bosons

Abstract

A search is presented for a high mass neutral particle that decays directly to the emu final state. The data sample was recorded by the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC from March to June 2011 and corresponds to an integrated luminosity of 1.07 fb^-1. The data are found to be consistent with the Standard Model background. The high emu mass region is used to set 95% confidence level upper limits on the production of two possible new physics processes: tau sneutrinos in an R-parity violating supersymmetric model and Z'-like vector bosons in a lepton flavor violating model.