Measurement of the ZZ Production Cross Section and Z → ℓ⁺ℓ⁻ℓ^′+ℓ^′− Branching Fraction in PP Collisions at s=13 TeV

Physics Letters B 2016
Vardan Khachatryan, A.M. Sirunyan, Viesturs Veckalns

Four-lepton production in proton–proton collisions, pp→(Z/γ⁎)(Z/γ⁎)→ℓ+ℓ−ℓ′+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<mℓ+ℓ−,mℓ′+ℓ′−<120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z→ℓ+ℓ−ℓ′+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<mℓ+ℓ−ℓ′+ℓ′−<100 GeV and dilepton mass mℓ+ℓ−<4 GeV for all opposite-sign, same-flavor lepton pairs. The results are in agreement with standard model predictions.

Atslēgas vārdi
CMS | Electroweak | Physics
DOI
10.1016/j.physletb.2016.10.054
Hipersaite
http://www.sciencedirect.com/science/article/pii/S0370269316306256

Khachatryan, V., Sirunyan, A., Veckalns, V. et al. Measurement of the ZZ Production Cross Section and Z → ℓ⁺ℓ⁻ℓ^′+ℓ^′− Branching Fraction in PP Collisions at s=13 TeV. Physics Letters B, 2016, Vol.763, 280.-303.lpp. ISSN 0370-2693. Pieejams: doi:10.1016/j.physletb.2016.10.054

Publikācijas valoda
English (en)