CMS Collaboration2022-08-312022-08-312020-06-10The CMS collaboration., Sirunyan, A.M., Tumasyan, A. et al. Measurement of the cross section for electroweak production of a Z boson, a photon and two jets in proton-proton collisions at s√ = 13 TeV and constraints on anomalous quartic couplings. J. High Energ. Phys. 2020, 76 (2020). https://doi.org/10.1007/JHEP06(2020)076https://hdl.handle.net/1808/33386A measurement is presented of the cross section for electroweak production of a Z boson and a photon in association with two jets (Zγjj) in proton-proton collisions. The Z boson candidates are selected through their decay into a pair of electrons or muons. The process of interest, electroweak Zγjj production, is isolated by selecting events with a large dijet mass and a large pseudorapidity gap between the two jets. The measurement is based on data collected at the CMS experiment at s√ = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The observed significance of the signal is 3.9 standard deviations, where a significance of 5.2 standard deviations is expected in the standard model. These results are combined with published results by CMS at s√ = 8 TeV, which leads to observed and expected respective significances of 4.7 and 5.5 standard deviations. From the 13 TeV data, a value is obtained for the signal strength of electroweak Zγjj production and bounds are given on quartic vector boson interactions in the framework of dimension-eight effective field theory operators.Copyright CERN, for the benefit of the CMS Collaboration. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0).http://creativecommons.org/licenses/by/4.0/Electroweak interactionHadron-Hadron scattering (experiments)Article10.1007/JHEP06(2020)076openAccess