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

ATLAS COLLABORATION, G. AAD, M.T. DOVA ET AL

JOURNAL OF HIGH ENERGY PHYSICS

SPRINGER

Lugar: Berlin; Año: 2013 vol. 03 p. 128 - 158

1126-6708

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() ! `+`􀀀`0+`0􀀀 and ZZ ! `+`􀀀 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, tot ZZ = 6.7  0.7 (stat.) +0:4 0:3 (syst.)  0.3 (lumi.) pb, which is consisteith the Standard Model prediction of 5.89+0:22 0:18 pb calculated at next-to-leading order in QCD. The normalized dierential cross sections in bins of various kinematic variables are presented. Finally, the dierential 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.