The production of Z boson pairs in proton–proton (pp) collisions, pp→(Z/∗)(Z/∗)→2ℓ2ℓ′, where ℓ,ℓ′=e or μ, is studied at a center-of-mass energy of 13TeV with the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 137fb−1, collected during 2016–2018. The ZZ production cross section, tot(pp→ZZ)=17.4±0.3(stat)±0.5(syst)±0.4(theo)±0.3(lumi) pb, measured for events with two pairs of opposite-sign, same-flavor leptons produced in the mass region 60<120GeV is consistent with standard model predictions. Differential cross sections are also measured and agree with theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ couplings.
Measurements of pp → ZZ production cross sections and constraints on anomalous triple gauge couplings at √s=13TeV
Musich, M.;Asenov, P.;Aime‘, C.;Bianchini, L.;Ciocci, M. A.;Donato, S.;Messineo, A.;Rizzi, A.;Tonelli, G.;Cipriani, M.;Marini, A. C.;
2021-01-01
Abstract
The production of Z boson pairs in proton–proton (pp) collisions, pp→(Z/∗)(Z/∗)→2ℓ2ℓ′, where ℓ,ℓ′=e or μ, is studied at a center-of-mass energy of 13TeV with the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 137fb−1, collected during 2016–2018. The ZZ production cross section, tot(pp→ZZ)=17.4±0.3(stat)±0.5(syst)±0.4(theo)±0.3(lumi) pb, measured for events with two pairs of opposite-sign, same-flavor leptons produced in the mass region 60<120GeV is consistent with standard model predictions. Differential cross sections are also measured and agree with theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ couplings.File | Dimensione | Formato | |
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