Search for narrow resonances in dilepton mass spectra in pp collisions at sqrt(s) = 7 TeV

(CMS Collaboration) Chatrchyan, S.; Godinović, Nikola; Pleština, Roko; Lelas, Damir; Polić, Dunja; Puljak, Ivica; Antunović, Željko; Kovač, Marko; Brigljević, Vuko; Đurić, Senka; Kadija, Krešo; Luetić, Jelena; Morović, Srećko; Mekterović, Darko; Swanson, J. (2012) Search for narrow resonances in dilepton mass spectra in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, 714 (2/5). pp. 158-179. ISSN 0370-2693

Preview

PDF - Published Version - article Available under License Creative Commons Attribution. Download (653kB) | Preview

Abstract

A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at sqrt(s) = 7 TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 inverse femtobarns. 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 Z'(psi) resonance, 890 (540) GeV for the Stueckelberg extension Z'(St) with the mass parameter epsilon = 0.06 (0.04), and 2140 (1810) GeV for Kaluza--Klein gravitons with the coupling parameter k/Mbar(Pl) of 0.10 (0.05). These limits are the most stringent to date.

Item Type:	Article
Uncontrolled Keywords:	CMS; dileptons; resonances
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Experimental physics at LHC energies (Eksperimentalna fizika na LHC energijama) Krešo Kadija 098-0982887-2878 MZOS Search for the Higgs boson and new physics with the CMS detector (Potraga za Higgsovim bozonom i novom fizikom detektorom CMS) Ivica Puljak 023-0982887-3064 MZOS
Depositing User:	Krešo Kadija
Date Deposited:	04 May 2016 10:17
URI:	http://fulir.irb.hr/id/eprint/2769
DOI:	10.1016/j.physletb.2012.06.051

Actions (login required)

View Item