Measurement of the $ZZ$ production cross section in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the $ZZ\to {\ell }^{-}{\ell }^{+}{\ell }^{\prime -}{\ell }^{\prime +}$ and $ZZ\to {\ell }^{-}{\ell }^{+}\nu \bar{\nu }$ channels with the ATLAS detector

Abstract

A measurement of the $ZZ$ production in the ${\ell }^{-}{\ell }^{+}{\ell }^{\prime -}{\ell }^{\prime +}$ and ${\ell }^{-}{\ell }^{+}\nu \bar{\nu }$ channels $(\ell =e,\mu )$ 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 $ZZ\to {\ell }^{-}{\ell }^{+}{\ell }^{\prime -}{\ell }^{\prime +}$ and $ZZ\to {\ell }^{-}{\ell }^{+}\nu \bar{\nu }$ 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 $7.3\pm 0.4\text{(stat)}\pm 0.3\text{(syst)}\pm 0.2\text{(lumi)}$ 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 $ZZ$ production.

55 pages in total, author list starting page 39, 9 figures, 11 tables, accepted for publication in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-16/

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• Constraining Sterile Neutrinos from Precision Higgs Data
• Next-to-leading-order electroweak corrections to the production of four charged leptons at the LHC
• $ZZ$ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel
• Search for direct production of supersymmetric partners of the top quark in the all-jets final state in proton-proton collisions at sqrt(s) = 13 TeV
• Measurements of the pp$\to$ZZ production cross section and the Z$\to 4\ell$ branching fraction, and constraints on anomalous triple gauge couplings at $\sqrt{s}=$ 13 TeV
• $ZZ$ production at the LHC: NNLO predictions for $2\ell 2\nu$ and $4\ell$ signatures
• Cosmological constraints with self-interacting sterile neutrinos
• NNLO predictions for Z-boson pair production at the LHC
• Anomalous triple-gauge-boson interactions in vector-boson pair production with RECOLA2
• $W^{+}{W}^{-}$ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel
• $ZZ$ production at nNNLO+PS with MiNNLO${}_{\text{PS}}$
• Search for anomalous triple gauge couplings in WW and WZ production in lepton + jet events in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurement of $ZZ$ production in the $\ell \ell \nu \nu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Next-to-next-to-leading order event generation for $Z$ boson pair production matched to parton shower
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• Measurements of the electroweak diboson production cross sections in proton-proton collisions at $\sqrt{s}=$ 5.02 TeV using leptonic decays
• Anomalous neutral gauge boson interactions and simplified models
• Threshold resummation for $Z$-boson pair production at NNLO+NNLL
• Effects of anomalous triple-gauge-boson interactions in diboson production with RECOLA2