Search for narrow resonances in dilepton mass spectra in pp collisions at [formula omitted

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Han,B Kilminster,K Ozdemir,Y S Gao ,H W K Cheung ,J G Branson ,L Scodellaro,P Govoni,L Fiore,S Hamdan,D Fasanella,Y M Tzeng ,J Wood,L S Durkin ,J Tao,P R Dudero ,J P Fernández Ramos ,C H Shepherd-Themistocleous ,A F Barfuss ,R G Kellogg ,K A Hahn ,D Hidas,S Braibant-Giacomelli,N Lychkovskaya,E Aguiló ,A Starodumov,L Mirabito,J P Chou ,K Klapoetke,D C Miner ,R Gupta,Alberto Orso Maria Iorio ,J E Ramirez Vargas ,F Nessi‐Tedaldi ,G R Snow

doi:10.1016/j.physletb.2012.06.051

Abstract

A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at s=7TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 fb−1. The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95% confidence level are 2330 GeV for the Z′ in the Sequential Standard Model, 2000 GeV for the superstring-inspired Zψ′ resonance, 890 (540) GeV for the Stueckelberg extension ZSt′ with the mass parameter ϵ=0.06 (0.04), and 2140 (1810) GeV for Kaluza–Klein gravitons with the coupling parameter k/M¯Pl of 0.10 (0.05). These limits are the most stringent to date.

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