Measurements of the pp →ZZ production cross section and the Z→4ℓ branching fraction, and constraints on anomalous triple gauge couplings at $$\sqrt{s}$$ = 13 TeV
Four-lepton production in proton-proton collisions, $$\mathrm {p}\mathrm {p}\rightarrow (\mathrm{Z}/ \gamma ^*)(\mathrm{Z}/\gamma ^*) \rightarrow 4\ell $$ , where $$\ell = \mathrm {e}$$ or $$\mu $$ , is studied at a center-of-mass energy of 13 $$\,\text {TeV}$$ with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 $$\,\text {fb}^{-1}$$ . The ZZ production cross section, $$\sigma (\mathrm {p}\mathrm {p}\rightarrow \mathrm{Z}\mathrm{Z}) = 17.2 \pm 0.5\,\text {(stat)} \pm 0.7\,\text {(syst)} \pm 0.4\,\text {(theo)} \pm 0.4\,\text {(lumi)} \text { pb} $$ , measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region $$60< m_{\ell ^+\ell ^-} < 120\,\text {GeV} $$ , is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be $$\mathcal {B}(\mathrm{Z}\rightarrow 4\ell ) = 4.8 \pm 0.2\,\text {(stat)} \pm 0.2\,\text {(syst)} \pm 0.1\,\text {(theo)} \pm 0.1\,\text {(lumi)} \times 10^{-6}$$ for events with a four-lepton invariant mass in the range $$80< m_{4\ell } < 100\,\text {GeV} $$ and a dilepton mass $$m_{\ell \ell } > 4\,\text {GeV} $$ for all opposite-sign, same-flavor lepton pairs. Finally, the results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ $$\gamma $$ couplings at 95% confidence level: $$-0.0012 < f_4^\mathrm{Z}<0.0010$$ , $$-0.0010 < f_5^\mathrm{Z} < 0.0013$$ , $$-0.0012 < f_4^{\gamma }<0.0013$$ , $$-0.0012 < f_5^{\gamma } < 0.0013$$ .
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1398796
- Report Number(s):
- FERMILAB-PUB-17-412-CMS; CMS-SMP-16-017; CERN-EP-2017-219; arXiv:1709.08601; 1625296
- Journal Information:
- European Physical Journal. C, Particles and Fields, Vol. 78, Issue 2; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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