TY - JOUR
T1 - Measurement of electroweak Z(νν̅)γjj production and limits on anomalous quartic gauge couplings in pp collisions at √s = 13 TeV with the ATLAS detector
AU - ATLAS Collaboration
AU - Allport, Phil
AU - Auriol, Adrien
AU - Bellos, Panagiotis
AU - Bird, Gareth
AU - Bracinik, Juraj
AU - Charlton, David
AU - Chisholm, Andrew
AU - George, William
AU - Gonella, Laura
AU - Hawkes, Chris
AU - Marinescu, Mihaela
AU - Mendes Jacques Da Costa, Antonio Manuel
AU - Neep, Thomas
AU - Newman, Paul
AU - Nikolopoulos, Konstantinos
AU - Cardoso Silva, Júlia
AU - Stampekis, Alexis
AU - Thomas, Jurgen
AU - Thompson, Paul
AU - Virdee, Gov
AU - Ward, Robert
AU - Watson, Alan
AU - Watson, Miriam
PY - 2023/6/14
Y1 - 2023/6/14
N2 - The electroweak production of Z(νν̅)γjj 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(νν̅)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(νν̅)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(νν̅)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.
AB - The electroweak production of Z(νν̅)γjj 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(νν̅)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(νν̅)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(νν̅)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.
KW - Electroweak Interaction
KW - Hadron-Hadron Scattering
UR - https://arxiv.org/abs/2208.12741
U2 - 10.1007/JHEP06(2023)082
DO - 10.1007/JHEP06(2023)082
M3 - Article
SN - 1126-6708
VL - 2023
JO - JHEP
JF - JHEP
IS - 6
M1 - 82
ER -