Measurement of the ZZ production cross section in proton-proton collisions at s=8 TeV using the ZZ → ?－?+?′－?′+ and ZZ→ ?－?+νν? decay channels with the ATLAS detector
英文:
Measurement of the ZZ production cross section in proton-proton collisions at s=8 TeV using the ZZ → ?－?+?′－?′+ and ZZ→ ?－?+νν? decay channels with the ATLAS detector
A measurement of the ZZ production cross section in the ?$^{－}$?$^{+}$?$^{′ －}$?$^{′ +}$ and $ {ell}^{-}{ell}^{+}nu overline{nu} $ channels (? = e, μ) in proton-proton collisions at $ sqrt{s}=8 $ TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb$^{－1}$ collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for ZZ → ?$^{－}$?$^{+}$?$^{′ －}$?$^{′ +}$ and $ ZZto {ell}^{-}{ell}^{+}nu overline{nu} $ are measured in selected phase-space regions. The total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV is measured from the combination of the two channels to be 7.3?±?0.4(stat)?±?0.3(syst)$_{－?0.1}^{－?0.2}$ (lumi)?pb, which is consistent with the Standard Model prediction of 6.?6$_{－?0.6}^{+?0.7}$ ?pb. The differential cross sections in bins of various kinematic variables are presented. 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
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