6533b821fe1ef96bd127bf44

RESEARCH PRODUCT

Measurement of the ZZ production cross section and limits on anomalous neutral triple gauge couplings in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector

Atlas CollaborationVasiliki MitsouLuca FioriniEduardo Ros MartínezJuan A. Fuster VerdúCarmen García GarcíaSusana Cabrera UrbánSalvador Martí GarcíaJosé Salt CairolsCarlos Lacasta LlácerJuan Antonio Valls FerrerMaría Victoria Castillo GiménezEmilio Higón RodríguezAntonio Ferrer SoriaSantiago González De La HozMohammed KaciYesenia Hernández JiménezVicente Lacuesta MiquelMiguel Villaplana Pérez

subject

High Energy Physics::ExperimentFísica nuclearAstrophysics::Cosmology and Extragalactic AstrophysicsNuclear Experiment

description

A measurement of the ZZ production cross section in proton-proton collisions at root s = 7 TeV using data corresponding to an integrated luminosity of 1.02 fb(-1) recorded by the ATLAS experiment at the LHC is presented. Twelve events containing two Z boson candidates decaying to electrons and/or muons are observed, with an expected background of 0.3 +/- 0.3(stat)(-0.3)(+0.4)(syst) events. The cross section measured in a phase-space region with good detector acceptance and for dilepton masses within the range 66 to 116 GeV is sigma(fid)(ZZ -> l+l-l+l-) = 19.4(-5.2)(+6.3)(stat)(-0.7)(+0.9)(syst) +/- 0.7(lumi) fb. The resulting total cross section for on-shell ZZ production, sigma(tot)(ZZ) = 8.5(-2.3)(+2.7)(stat)(-0.3)(+0.4)(syst) +/- 0.3(lumi) pb, is consistent with the standard model expectation of 6.5(-0.2)(+0.3) pb calculated at the next-to-leading order in QCD. Limits on anomalous neutral triple gauge boson couplings are derived.

yearjournalcountryeditionlanguage
2012-01-01
10.1103/physrevlett.108.041804http://hdl.handle.net/10550/35476