Observation of electroweak production of two jets and a $Z$-boson pair

The ATLAS collaboration
Nature Phys. 19 (2023) 237-253, 2023.

Abstract (data abstract)
Electroweak symmetry breaking explains the origin of the masses of elementary particles through their interactions with the Higgs field. Besides the measurements of the Higgs boson properties, the study of the scattering of massive vector bosons with spin one allows the nature of electroweak symmetry breaking to be probed. Among all processes related to vector-boson scattering, the electroweak production of two jets and a $Z$-boson pair is a rare and important one. Here we report the observation of this process from proton-proton collision data corresponding to an integrated luminosity of 139 $\text{fb}^{-1}$ recorded at a centre-of-mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider. We consider two different final states originating from the decays of the $Z$-boson pair - one containing four charged leptons and the other containing two charged leptons and two neutrinos. The hypothesis of no electroweak production is rejected with a statistical significance of 5.7 $\sigma$, and the measured cross-section for electroweak production is consistent with the standard model prediction. In addition, we report cross-sections for inclusive production of a $Z$-boson pair and two jets for the two final states.

  • Table 1

    Data from page 13, Table 2 current version

    10.17182/hepdata.93015.v2/t1

    Signal strength and significance of EW ZZjj processes

  • Table 2

    Data from page 14, Table 3 current version

    10.17182/hepdata.93015.v2/t2

    Measured and predicted fiducial cross-sections in both the lllljj and ll$\nu\nu$jj channels for the inclusive ZZjj processes. Uncertainties due to...

  • figure 1

    Data from page 12, Figure 3(a) current version

    10.17182/hepdata.93015.v2/t3

    Observed and expected multivariate discriminant distribution in the $\ell\ell\ell\ell jj$ QCD CR.

  • figure 2

    Data from page 12, Figure 3(b) current version

    10.17182/hepdata.93015.v2/t4

    Observed and expected multivariate discriminant distribution in the $\ell\ell\ell\ell jj$ SR.

  • figure 3

    Data from page 12, Figure 3(c) current version

    10.17182/hepdata.93015.v2/t5

    Observed and expected multivariate discriminant distribution in the $\ell\ell\nu\nu jj$ SR.

Version 2 modifications: Add table to show the measured mu and observed (expected) significance, and three BDT plots which enter the final fit.

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