A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton–proton collisions at √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 → lll'l', where l = e,μ and l' = e,μ, τ . The measured total cross section σ(pp → ZZ) = 7.7 ± 0.5 (stat)+0.5−0.4 (syst) ± 0.4 (theo) ±0.2 (lumi) 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 ZZγ couplings at the 95% confidence level: −0.004 < (f_4)^Z < 0.004, −0.004 < (f_5)^Z < 0.004, −0.005 < (f_4)^γ < 0.005, and −0.005 < (f_5)^γ < 0.005.
Measurement of the pp→ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at √s = 8 TeV
Sola, V[ 39 ];AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;CASASSO, STEFANO;COSTA, Marco;DEGANO, Alessandro;FINCO, LINDA;MIGLIORE, Ernesto;MONACO, Vincenzo;MUSICH, MARCO;OBERTINO, Maria Margherita;ORTONA, GIACOMO;PACHER, LUCA;PINNA ANGIONI, GIAN LUCA;POTENZA, ALBERTO;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;TAMPONI, UMBERTO;COVARELLI, Roberto;
2015-01-01
Abstract
A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton–proton collisions at √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 → lll'l', where l = e,μ and l' = e,μ, τ . The measured total cross section σ(pp → ZZ) = 7.7 ± 0.5 (stat)+0.5−0.4 (syst) ± 0.4 (theo) ±0.2 (lumi) 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 ZZγ couplings at the 95% confidence level: −0.004 < (f_4)^Z < 0.004, −0.004 < (f_5)^Z < 0.004, −0.005 < (f_4)^γ < 0.005, and −0.005 < (f_5)^γ < 0.005.File | Dimensione | Formato | |
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