Measurements of electroweak production of a photon in association with two jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
Hayrapetyan, Aram , Makarenko, Vladimir , Tumasyan, Armen , Adam, Wolfgang , Andrejkovic, Janik Walter , Benato, Lisa , Bergauer, Thomas , Dragicevic, Marko , Giordano, Cristina , Hussain, Priya Sajid
CMS-SMP-19-005, 2025.

Abstract (data abstract)
The first observation of electroweak production of a photon in association with two forward jets in proton-proton collisions is presented. The measurement uses data recorded by the CMS experiment at the LHC during 2016--2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. The analysis is performed in a region enriched in photon production via vector boson fusion, with a requirement on the transverse momentum of the photon to exceed 200 GeV. The cross section is measured to be $202^{+36}_{-32}~\mathrm{fb}$, at a significance with respect to the null hypothesis that exceeds five standard deviations. This is in agreement with the standard model prediction of $177^{+13}_{-12}~\mathrm{fb}$. Differential cross sections are measured as a function of various observables. Limits are set on dimension-6 effective field theory operators that contribute to the WW$\gamma$ interaction. The observed 95\% confidence intervals for the corresponding Warsaw basis Wilson coefficients $c_{\mathrm{W}}$ and $c_{\mathrm{HWB}}$ are $[-0.11, 0.16]$ and $[-1.6, 1.5]$, respectively.

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