Measurement of the ZZ production cross section and Z → ℓ+′+′− branching fraction in pp collisions at s=13 TeV

The CMS collaboration

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Four-lepton production in proton–proton collisions, pp→(Z/γ)(Z/γ)→ℓ+′+′−, where ℓ,ℓ=e or μ, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 fb−1. The ZZ production cross section, σ(pp→ZZ)=14.6−1.8 +1.9(stat)−0.3 +0.5(syst)±0.2(theo)±0.4(lumi)pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60<m+,m′+′−<120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z→ℓ+′+′−)=4.9−0.7 +0.8 (stat)−0.2 +0.3 (syst)−0.1 +0.2(theo)±0.1(lumi)×10−6 for the four-lepton invariant mass in the range 80<m+′+′−<100 GeV and dilepton mass m+>4 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.

Original languageEnglish
Pages (from-to)280-303
Number of pages24
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Dec 10 2016


  • CMS
  • Electroweak
  • Physics


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