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dc.contributor.authorCMS collaboration
Adair, A.
Akgun, B.
Chen, Z.
Ecklund, K.M.
Geurts, F.J.M.
Guilbaud, M.
Li, W.
Michlin, B.
Northup, M.
Padley, B.P.
Roberts, J.
Rorie, J.
Tu, Z.
Zabel, J.
dc.date.accessioned 2018-12-06T18:40:45Z
dc.date.available 2018-12-06T18:40:45Z
dc.date.issued 2018
dc.identifier.citation CMS collaboration, Adair, A., Akgun, B., et al.. "Measurements of the pp→ZZ production cross section and the Z→4ℓ branching fraction, and constraints on anomalous triple gauge couplings at s√=13TeV." The European Physical Journal C, 78, (2018) Springer: https://doi.org/10.1140/epjc/s10052-018-5567-9.
dc.identifier.urihttps://hdl.handle.net/1911/103788
dc.description.abstract Four-lepton production in proton-proton collisions, pp→(Z/γ∗)(Z/γ∗)→4ℓpp→(Z/γ∗)(Z/γ∗)→4ℓ\mathrm {p}\mathrm {p}\rightarrow (\mathrm{Z}/ \gamma ^*)(\mathrm{Z}/\gamma ^*) \rightarrow 4\ell , where ℓ=eℓ=e\ell = \mathrm {e} or μμ\mu , is studied at a center-of-mass energy of 13TeVTeV\,\text {TeV} with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9fb−1fb−1\,\text {fb}^{-1}. The ZZ production cross section, σ(pp→ZZ)=17.2±0.5(stat)±0.7(syst)±0.4(theo)±0.4(lumi) pbσ(pp→ZZ)=17.2±0.5(stat)±0.7(syst)±0.4(theo)±0.4(lumi) pb\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<mℓ+ℓ−<120GeV60<mℓ+ℓ−<120GeV60< 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 B(Z→4ℓ)=4.83+0.23−0.22(stat)+0.32−0.29(syst)±0.08(theo)±0.12(lumi)×10−6B(Z→4ℓ)=4.83−0.22+0.23(stat)−0.29+0.32(syst)±0.08(theo)±0.12(lumi)×10−6\mathcal {B}(\mathrm{Z}\rightarrow 4\ell ) = 4.83 _{-0.22}^{+0.23} (stat)_{-0.29}^{+0.32} (syst) \pm 0.08 (theo) \pm 0.12 (lumi) \times 10^{-6} for events with a four-lepton invariant mass in the range 80<m4ℓ<100GeV80<m4ℓ<100GeV80< m_{4\ell } < 100\,\text {GeV} and a dilepton mass mℓℓ>4GeVmℓℓ>4GeVm_{\ell \ell } > 4\,\text {GeV} for all opposite-sign, same-flavor lepton pairs. 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 ZZγγ\gamma couplings at 95% confidence level: −0.0012<fZ4<0.0010−0.0012<f4Z<0.0010-0.0012<f_4^\mathrm{Z}<0.0010, −0.0010<fZ5<0.0013−0.0010<f5Z<0.0013-0.0010<f_5^\mathrm{Z}<0.0013, −0.0012<fγ4<0.0013−0.0012<f4γ<0.0013-0.0012<f_4^{\gamma }<0.0013, −0.0012<fγ5<0.0013−0.0012<f5γ<0.0013-0.0012<f_5^{\gamma }< 0.0013.
dc.language.iso eng
dc.publisher Springer
dc.rightsThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Measurements of the pp→ZZ production cross section and the Z→4ℓ branching fraction, and constraints on anomalous triple gauge couplings at s√=13TeV
dc.type Journal article
dc.citation.journalTitle The European Physical Journal C
dc.citation.volumeNumber 78
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1140/epjc/s10052-018-5567-9
dc.type.publication publisher version
dc.citation.articleNumber 165


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This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Except where otherwise noted, this item's license is described as This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.