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Title: Measurement of the ZZ production cross section and Z → ℓ+ℓ–ℓ'+ℓ'– branching fraction in pp collisions at s = 13   TeV

Journal Article · · Physics Letters. B
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
+ Show Author Affiliations

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 60ℓ+ℓ–,mℓ'+ℓ'–<120 GeV60+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+ℓ–ℓ'+ℓ'–<100 GeV80+ℓ–ℓ'+ℓ'–<100 GeV and dilepton mass mℓ+ℓ– >4 GeV for all opposite-sign, same-flavor lepton pairs. Lastly, the results are in agreement with standard model predictions.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1294450
Alternate ID(s):
OSTI ID: 1600015; OSTI ID: 1330899
Report Number(s):
FERMILAB-PUB--16-306-CMS; CMS-SMP--16-001; CERN-EP--2016-174; arXiv:1607.08834; 1478600
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Journal Issue: C Vol. 763; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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