Measurements of pp $\to$ ZZ production cross sections and constraints on anomalous triple gauge couplings at $\sqrt{s}=$ 13 TeV

Abstract

The production of Z boson pairs in proton-proton (pp) collisions, pp $\to$ (Z/${\gamma }^{\ast }$)(Z/${\gamma }^{\ast }$) $\to$ 2$\ell$ 2${\ell }^{\prime }$, where $\ell ,{\ell }^{\prime }$ = 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, ${\sigma }_{\text{tot}}$ (pp $\to$ ZZ) = 17.2 $\pm$ 0.3 (stat) $\pm$ 0.5 (syst) $\pm$ 0.4 (theo) $\pm$ 0.3 (lumi) pb, measured for events with two pairs of opposite-sign, same-flavor leptons produced in the mass region 60 $<$ $m_{{\ell }^{+}{\ell }^{-}}$ $<$ 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.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-19-001 (CMS Public Pages)

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