Measurement of electroweak Z(ν ¯ν)γjj production and limits on anomalous quartic gauge couplings in pp collisions at √s = 13 TeV with the ATLAS detector
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Electroweak InteractionHadron-Hadron Scattering
ATLAS collaboration., Aad, G., Abbott, B. et al. Measurement of electroweak Z(νν¯¯¯)γjj production and limits on anomalous quartic gauge couplings in pp collisions at s√ = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2023, 82 (2023). [https://doi.org/10.1007/JHEP06(2023)082]
SponsorshipCERN; MICINN; COST; ERC; ERDF; Horizon 2020; Marie Skłodowska-Curie Actions; European Union; La Caixa Banking Foundation; Generalitat de Catalunya CERCA; PROMETEO; Generalitat Valenciana GenT; PIC
The electroweak production of Z(ν ¯ν)γ in association with two jets is studied in a regime with a photon of high transverse momentum above 150 GeV using proton–proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider. The analysis uses a data sample with an integrated luminosity of 139 fb−1 collected by the ATLAS detector during the 2015–2018 LHC data-taking period. This process is an important probe of the electroweak symmetry breaking mechanism in the Standard Model and is sensitive to quartic gauge boson couplings via vector-boson scattering. The fiducial Z(ν ¯ν)γjj cross section for electroweak production is measured to be 0.77+0.34 −0.30 fb and is consistent with the Standard Model prediction. Evidence of electroweak Z(ν ¯ν)γjj production is found with an observed significance of 3.2σ for the background-only hypothesis, compared with an expected significance of 3.7σ. The combination of this result with the previously published ATLAS observation of electroweak Z(ν ¯ν)γjj production yields an observed (expected) signal significance of 6.3σ (6.6σ). Limits on anomalous quartic gauge boson couplings are obtained in the framework of effective field theory with dimension-8 operators.