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Measurement of the $pp \to ZZ$ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at $\sqrt s=$8 TeV

The CMS collaboration
Phys.Lett. B740 (2015) 250-272, 2015

Abstract (data abstract)
CERN-LHC. A measurement of inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton-proton collisions at sqrt(s) = 8 TeV are presented. A data sample, corresponding to an integrated luminosity of 19.6 inverse femtobarns was collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZ to lll'l', where l = e, mu and l' = e, mu, tau. The measured total cross section, sigma(pp to ZZ) = 7.7 +/- 0.5 (stat.) +0.5-0.4 (syst.) +/- 0.4 (theo.) +/- 0.2 (lum.) pb for both Z bosons produced in the mass range 60 < m[Z] < 120 GeV, is consistent with standard model predictions. Differential cross sections are measured and well described by the theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ gamma couplings at the 95% confidence level: -0.004 < f[4,Z] < 0.004, -0.004 < f[5,Z] < 0.004, -0.005 < f[4,gamma] < 0.005, and -0.005 < f[5,gamma] < 0.005 The 4l channel fiducial region is defined as: - 4e, 4mu or 2e2mu - Ambiguities in pairing are resolved by choosing the combination that results in the smallest value of the |mll - mZ|, where mll is the mass of the dilepton system. - ptMuon > 5 GeV - ptElectron > 7 GeV - at least one lepton pt > 20 GeV and another one with pt > 10 GeV - |etaMuon| < 2.4 - |etaElectron| < 2.5 - Both lepton pairs from Z are required to have invariant mass between 60 and 120 GeV. - any same flavour opposite sign combination should have mass > 4 GeV The total phase space is defined as: - Both lepton pairs are required to have invariant mass between 60 and 120 GeV.

  • Table 1

    Data from Table 2

    10.17182/hepdata.67317.v1/t1

    The total ZZ production cross section (P P --> Z0 Z0 X, 60GeV < mll < 120GeV) as measured in...

  • Table 2

    Data from Figure 3 (upper left)

    10.17182/hepdata.67317.v1/t2

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

  • Table 3

    Data from Figure 3 (upper right)

    10.17182/hepdata.67317.v1/t3

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

  • Table 4

    Data from Figure 3 (lower left)

    10.17182/hepdata.67317.v1/t4

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

  • Table 5

    Data from Figure 3 (lower right)

    10.17182/hepdata.67317.v1/t5

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

  • Table 6

    Data from Figure 4 (left)

    10.17182/hepdata.67317.v1/t6

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

  • Table 7

    Data from Figure 4 (right)

    10.17182/hepdata.67317.v1/t7

    Differential cross sections normalized to the fiducial cross section for the combined 4e, 4mu and 2e2mu decay channels as a...

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