Abstract
Measurements of ZZ production in the f+f−fl+fl− channel in proton–proton collisions at 13 TeV
center-of-mass energy at the Large Hadron Collider are presented. The data corre- spond to 36.1
fb−1 of collisions collected by the ATLAS experiment in 2015 and 2016. Here f and fl stand for
electrons or muons. Integrated and differential ZZ → f+f−fl+fl− cross sections with Z → f+f−
candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space
corresponding to the detector acceptance and corrected for detector effects. The differential cross
sections are presented in bins of twenty observables, including several that describe the jet
activity. The integrated cross section is also extrapolated to a total phase space and to all
Standard Model decays of Z bosons with mass between 66 GeV and 116 GeV, resulting in a value of
17.3 ± 0.9 [±0.6 (stat.) ±0.5 (syst.) ±0.6 (lumi.)] pb. The measurements are found to be in good
agreement with the Standard Model. A search for neutral triple gauge couplings is performed using
the transverse momentum distribution of the leading Z boson candidate. No evidence for such
couplings is found and exclusion limits
are set on their parameters.