Measurements of pp → ZZ production cross sections and constraints on anomalous triple gauge couplings at √s=13 TeV

The production of Z boson pairs in proton-proton (pp) collisions, pp -> (Z/gamma*)(Z/gamma*) -> 2l2l', where l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 137 fb(-1), collected during 2016-2018. The ZZ production cross section, sigma(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 < m(l+l-) < 120 GeV 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 gamma couplings.

Automated summary

The production of Z boson pairs in proton-proton collisions at the CERN LHC was studied using the CMS detector, and the measured cross sections are consistent with standard model predictions. Limits on anomalous ZZZ and ZZ gamma couplings were set using the invariant mass distribution of the four-lepton system.