Measurement of the pp - GT ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at root s=8 TeV
CMS Collaboration (ukupan broj autora: 2136)
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A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton-proton collisions at root s = 8 TeV are presented. The analysis is based on a data sample, corresponding to an integrated luminosity of 19.6 fb(-1), collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZ - GT llll, where = e, mu and l = e, mu, tau. The measured total cross section sigma(pp - GT ZZ) = 7.7 +/- 0.5 (stat) (0)(-0.4)(+0.5) (syst) +/- 0.4 (theo) +/- 0.2 (lumi) pb, for both Z bosons produced in the mass range 60 LT m(z) LT 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 LT f(4)(Z), LT 0.004, -0.004 LT f(5)(Z) LT 0.004, -0.005 LT f(5)(Z) LT 0.005, and -0....005 LT f(5)(Y) LT 0.005. (C) 2014 The Authors. Published by Elsevier B.V.
Keywords:CMS / Physics / Electroweak
Source:Physics Letters B, 2015, 740, 250-272
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