A measurement of the fiducial cross section of the associated production of a Z boson and a high-pT photon, where the Z decays to two neutrinos, and a search for anomalous triple gauge couplings are reported. The results are based on data collected by the CMS experiment at the LHC in proton-proton collisions at s = 13 TeV during 2016-2018, corresponding to an integrated luminosity of 138 fb^-1. The fiducial Zγ cross section, where a photon with a pT greater than 225 GeV is produced in association with a Z, and the Z decays to a νν pair (Z (νν) γ), is measured to be 23. 3^+1. 4-₁. ₃ fb, in agreement, within uncertainties, with the standard model prediction. The differential cross section as a function of the photon pT has been measured and compared with standard model predictions computed at next-to-leading and at next-to-next-to-leading order in perturbative quantum chromodynamics. Constraints have been placed on the presence of anomalous couplings that affect the ZZγ and Zγγ vertex using the pT spectrum of the photons. The observed 95% confidence level intervals for CP-conserving h₃^γ and h₄^γ are determined to be (-3. 4, 3. 5) 10^-4 and (-6. 8, 6. 8) 10^-7, and for h₃Z and h₄Z they are (-2. 2, 2. 2) 10^-4 and (-4. 1, 4. 2) 10^-7, respectively. These are the strictest limits to date on h₃^γ, h₃Z and h₄Z.
Hayrapetyan et al. (Wed,) studied this question.
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