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Measurement of the ZZ Production Cross Section and Limits on Anomalous Neutral Triple Gauge Couplings in Proton-Proton Collisions at root s=7 TeV with the ATLAS Detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 4, 041804- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 108, no 4, 041804- p.
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-91439DOI: 10.1103/PhysRevLett.108.041804ISI: 000299826400004ScopusID: 2-s2.0-84862908204OAI: diva2:510255
Knut and Alice Wallenberg Foundation
QC 20120315Available from: 2012-03-15 Created: 2012-03-15Bibliographically approved

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Lund-Jensen, BengtStrandberg, Jonas
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