Vector boson scattering and anomalous quartic couplings in final states with $\ellν$qq or $\ell\ell$qq plus jets using proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-SMP-22-011, 2025.

Abstract (data abstract)
A measurement is presented of the electroweak vector boson scattering production of ZV (V = W, Z) boson pairs associated with two jets in proton-proton collisions at a center-of-mass energy of 13 TeV. The data, corresponding to an integrated luminosity of 138 fb$^{-1}$, were collected at the CERN LHC with the CMS detector during the 2016--2018 data-taking period. The analysis targets final states with a pair of isolated electrons or muons from Z boson decays and three or four jets, depending on the momentum of the vector boson that decays into quarks. Signal strength is measured for events characterized by a large invariant mass of two forward jets with a wide pseudorapidity gap between them. The electroweak production of ZV in association with two jets is measured with an observed (expected) significance of 1.3 (1.8) standard deviations. A combination of the analyses of ZV channel and the previously published WV channel in the lepton plus jets final state places constraints on effective field theory parameters that describe anomalous electroweak production of WW, WZ, and ZZ boson pairs in association with two jets. Several world best limits are set on anomalous quartic gauge couplings in terms of dimension-8 standard model effective field theory operators.

  • Figure 3a

    Data from Figure 3a (upper left).

    10.17182/hepdata.165281.v1/t1

    Distributions of DNN score for the data and post-fit backgrounds (stacked histograms), in the SRs of the ZV channel for...

  • Figure 3b

    Data from Figure 3b (upper right).

    10.17182/hepdata.165281.v1/t2

    Distributions of DNN score for the data and post-fit backgrounds (stacked histograms), in the SRs of the ZV channel for...

  • Figure 3c

    Data from Figure 3c (down left).

    10.17182/hepdata.165281.v1/t3

    Distributions of DNN score for the data and post-fit backgrounds (stacked histograms), in the SRs of the ZV channel for...

  • Figure 3d

    Data from Figure 3d (down right).

    10.17182/hepdata.165281.v1/t4

    Distributions of DNN score for the data and post-fit backgrounds (stacked histograms), in the SRs of the ZV channel for...

  • Figure 4a

    Data from Figure 4a (left).

    10.17182/hepdata.165281.v1/t5

    Distributions of M(ZV) for the data and post-fit backgrounds (stacked histograms), in the SRs of the merged b tag (left)...

  • Figure 4b

    Data from Figure 4b (right).

    10.17182/hepdata.165281.v1/t6

    Distributions of M(ZV) for the data and post-fit backgrounds (stacked histograms), in the SRs of the merged b tag (left)...

  • Figure 5a

    Data from Figure 5a (left).

    10.17182/hepdata.165281.v1/t7

    Distributions of M(WV) for the data and post-fit backgrounds (stacked histograms), in the SRs of the electron (left) and muon...

  • Figure 5b

    Data from Figure 5b (right).

    10.17182/hepdata.165281.v1/t8

    Distributions of M(WV) for the data and post-fit backgrounds (stacked histograms), in the SRs of the electron (left) and muon...

  • EFT limits on quartic operators

    Main results section

    10.17182/hepdata.165281.v1/t9

    Observed and expected 95% CL intervals on the parameters of quartic operators in the WV and ZV channels, and their...

  • Measured EW ZV signal strength

    Main results section

    10.17182/hepdata.165281.v1/t10

    Measured and expected signal strength μ for EW ZV production.

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