Measurement of the electroweak production of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>?</mml:mi></mml:math> and two jets in proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math> and constraints on anomalous quartic gauge couplings

The first observation of the electroweak (EW) production a Z boson, photon, and two forward jets (Z?jj) in proton-proton collisions at center-of-mass energy 13 TeV is presented. A data set corresponding to an integrated luminosity 137 fb?1, collected by CMS experiment LHC 2016–2018 used. measured fiducial cross section for EW Z?jj ?EW=5.21±0.52(stat)±0.56(syst) fb=5.21±0.76 fb. Single-differential sections leading lepton, jet transverse momenta, double-differential mjj |??jj| are also measured. Exclusion limits on anomalous quartic gauge couplings derived 95% confidence level terms effective field theory operators M0 M5, M7, T0 T2, T5 T9.3 MoreReceived 21 June 2021Accepted 30 August 2021DOI:https://doi.org/10.1103/PhysRevD.104.072001Published American Physical Society under Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.© 2021 CERN, CollaborationPhysics Subject Headings (PhySH)Physical SystemsPhotonsW & bosonsTechniquesHadron collidersParticles Fields