Measurements of the production cross section and the branching fraction, and constraints on anomalous triple gauge...

Four-lepton production in proton-proton collisions, $$ , where $$ or $$ , is studied at a center-of-mass energy of 13 $$ with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 $$ . The ZZ production cross section, $$ , measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region $$ , is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be $$ for events with a four-lepton invariant mass in the range $$ and a dilepton mass $$ for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ $$ couplings at 95% confidence level: $$ , $$ , $$ , $$ .