Abstract: Four-lepton production in proton-proton collisions, p p ? (Z / ??) (Z / ??) ? 4 ?, where ?= e or ?, is studied at a center-of-mass energy of 13TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9fb-1. The ZZ production cross section, ?(pp?ZZ)=17.2±0.5(stat)±0.7(syst)±0.4(theo)±0.4(lumi) pb, measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60

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