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Measurement of ZZ production in pp collisions at √s=7 TeV and limits on anomalous ZZZ and ZZγ couplings with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 128, 47
Publication date2013
Abstract

A measurement of the ZZ production cross section in proton-proton collisions at √s=7 TeV using data recorded by the ATLAS experiment at the Large Hadron Collider is presented. In a data sample corresponding to an integrated luminosity of 4.6 fb−1 collected in 2011, events are selected that are consistent either with two Z bosons decaying to electrons or muons or with one Z boson decaying to electrons or muons and a second Z boson decaying to neutrinos. The ZZ (*)→ℓ+ℓ−ℓ′+ℓ′− and ZZ→ℓ+ℓ−νν cross sections are measured in restricted phase-space regions. These results are then used to derive the total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV, σtotZZ=6.7±0.7(stat.)+0.4−0.3(syst.)±0.3(lumi.) pb, which is consistent with the Standard Model prediction of 5.89+0.22−0.18 pb calculated at next-to-leading order in QCD. The normalized differential cross sections in bins of various kinematic variables are presented. Finally, the differential event yield as a function of the transverse momentum of the leading Z boson is used to set limits on anomalous neutral triple gauge boson couplings in ZZ production.

Keywords
  • Hadron-Hadron Scattering
Citation (ISO format)
ATLAS Collaboration. Measurement of <em>ZZ</em> production in <em>pp</em> collisions at √s=7 TeV and limits on anomalous <em>ZZZ</em> and <em>ZZγ</em> couplings with the ATLAS detector. In: The journal of high energy physics, 2013, vol. 128, p. 47. doi: 10.1007/JHEP03(2013)128
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Article (Published version)
accessLevelPublic
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ISSN of the journal1029-8479
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