Search for resonances in the dilepton mass distribution in pp collisions at √s = 7TeV
Journal
Journal of High Energy Physics
Journal Volume
2011
Journal Issue
5
Date Issued
2011
Author(s)
Correction Chatrchyan, S.
Abstract
A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using pp collision data recorded at s = 7 TeV. The event samples correspond to integrated luminosities of 40 pb -1 in the dimuon channel and 35 pb -1 in the dielectron channel. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons (Z ) or as Kaluza-Klein graviton excitations (G KK ) in the Randall-Sundrum model. Upper limits on the inclusive cross section of Z (G KK ) + -relative to Z + -are presented. These limits exclude at 95% confidence level a Z with standard-model-like couplings below 1140 GeV, the superstring-inspired Z below 887 GeV, and, for values of the coupling parameter k/M Pl of 0.05 (0.1), Kaluza-Klein gravitons below 855 (1079) GeV.
Type
journal article