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

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[superscript −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 [superscript (*)] → ℓ [superscript +] ℓ [superscript −] ℓ [superscript ′+] ℓ [superscript ′−] and ZZ→ℓ[superscript +]ℓ[superscript −]ν[bar over v] 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, σ[tot over ZZ] = 6.7 ± 0.7 (stat.) [+0.4 over −0.3] (syst.) ± 0.3 (lumi.) pb, which is consistent with the Standard Model prediction of 5.89[+0.22 over −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.