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.

Table 2

Table 2 located in page 10

10.17182/hepdata.167074.v1/t1

Summary of uncertainties affecting the measurement as extracted from the fit to data. The total uncertainty is obtained by adding...
Figure 7

Data from Figure 7, located on page 10.

10.17182/hepdata.167074.v1/t2

The rapidity gap fraction as a function of $p_{\mathrm{T}^{veto}}$ in data and simulated samples for EW $\gamma$jj and QCD $\gamma$jj....
Figure 9a

Data from Figure 9 (upper left), located on page 13.

10.17182/hepdata.167074.v1/t3

Normalized differential cross sections, compared with the SM predictions, as a function of the absolute value of pseudorapidity of the...
Figure 9b

Data from Figure 9 (upper right), located on page 13.

10.17182/hepdata.167074.v1/t4

Normalized differential cross sections, compared with the SM predictions, as a function of the absolute value of pseudorapidity of the...
Figure 9c

Data from Figure 9 (middle left), located on page 13.

10.17182/hepdata.167074.v1/t5

Normalized differential cross sections, compared with the SM predictions, as a function of the invariant mass of the two jets....
Figure 9d

Data from Figure 9 (middle right), located on page 13.

10.17182/hepdata.167074.v1/t6

Normalized differential cross sections, compared with the SM predictions, as a function of the photon's transverse momentum. The SM predictions...
Figure 9e

Data from Figure 9 (lower left), located on page 13.

10.17182/hepdata.167074.v1/t7

Normalized differential cross sections, compared with the SM predictions, as a function of the event centrality as defined in Ref.[13]...
Figure 9f

Data from Figure 9 (lower right), located on page 13.

10.17182/hepdata.167074.v1/t8

Normalized differential cross sections, compared with the SM predictions, as a function of the Zeppenfeld variable that is defined in...
Figure 11a

Data from Figure 11a, located on page 15.

10.17182/hepdata.167074.v1/t9

Negative of twice in the difference in the log-likelihood as a function of $c_{\mathrm{W}}$, based on 138 $\mathrm{fb}^{-1}$ of CMS...
Figure 11b

Data from Figure 11b, located on page 15.

10.17182/hepdata.167074.v1/t10

Negative of twice in the difference in the log-likelihood as a function of $c_{\mathrm{HWB}}$, based on 138 $\mathrm{fb}^{-1}$ of CMS...
Figure 11c

Data from Figure 11c, located on page 15.

10.17182/hepdata.167074.v1/t11

Negative of twice in the difference in the log-likelihood as a function of $c_{\mathrm{HWB}}$ and $c_{\mathrm{W}}$, based on 138 $\mathrm{fb}^{-1}$...
Tabulated result for the fiducial cross section

Numbers are taken from the text.

10.17182/hepdata.167074.v1/t12

Predicted and measured EWK $\gamma\mathrm{jj}$ fiducial cross sections.

Table 2

Figure 7

Figure 9a

Figure 9b

Figure 9c

Figure 9d

Figure 9e

Figure 9f

Figure 11a

Figure 11b

Figure 11c

Tabulated result for the fiducial cross section

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