Measurement of electroweak $$Z\left(\nu \overline{\nu}\right)\gamma jj$$ production and limits on anomalous quartic gauge couplings in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector
- Centre National de la Recherche Scientifique (CNRS) (France); Aix-Marseille Univ., Marseille (France); ATLAS Collaboration. et al.
The electroweak production of $$Z\left(\nu \overline{\nu}\right)\gamma jj$$ 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 $$Z\left(\nu \overline{\nu}\right)\gamma jj$$ cross section for electroweak production is measured to be $${0.77}_{-0.30}^{+0.34}$$ fb and is consistent with the Standard Model prediction. Evidence of electroweak $$Z\left(\nu \overline{\nu}\right)\gamma jj$$ 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 $$Z\left(\nu \overline{\nu}\right)\gamma jj$$ 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2282285
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2023, Issue 6; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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