Abstract (data abstract)

This analysis presents an observation of the photon-fusion production of $W$ boson pairs using the CMS detector at the LHC. The total cross section of the $W^+W^-$ production in photon fusion is measured using proton-proton collision data with an integrated luminosity of $138\ \mathrm{fb^{-1}}$ collected with the CMS detector in 2016--2018 at a center-of-mass energy of $\sqrt{s}=13\ \mathrm{TeV}$. Events are selected in the final state with one isolated electron and one isolated muon, and no additional tracks associated with the electron-muon production vertex. The total and fiducial production cross sections are $643^{+82}_{-78}\ \mathrm{fb}$ and $3.96^{+0.53}_{-0.51}\ \mathrm{fb}$, respectively, in agreement with the standard model predictions of $631\pm 126\ \mathrm{fb}$ and $3.87\pm 0.77\ \mathrm{fb}$. This agreement enables stringent constraints to be imposed on anomalous quartic gauge couplings within a dimension-8 effective field theory framework.

Figure 1 Left

Data from Figure 1 Left

10.17182/hepdata.167352.v1/t1

Normalized simulated $N_{tracks}$ distributions for signal and background processes.
Figure 1 Right

Data from Figure 1 Right

10.17182/hepdata.167352.v1/t2

Normalized simulated acoplanarity distributions for signal and background processes. The acoplanarity distribution is shown for events with $N_{tracks}=0$.
Figure 2 Left

Data from Figure 2 Left

10.17182/hepdata.167352.v1/t3

Observed and predicted $p_{T}^{e\mu}$ distributions for events with $N_{tracks}=0$, using 2016--2018 data. The distributions are shown after the maximum likelihood...
Figure 2 Right

Data from Figure 2 Right

10.17182/hepdata.167352.v1/t4

Observed and predicted $p_{T}^{e\mu}$ distributions for events with 1<=$N_{tracks}$<=5 (CR), using 2016--2018 data. The distributions are shown after the maximum...
Figure 3

Data from Figure 3

10.17182/hepdata.167352.v1/t5

Distribution of $p_{T}^{e\mu}$ for the difference between the observed number of events and the expected number of background events (black...
Figure 4&5

Data from Figure 4 and Figure 5

10.17182/hepdata.167352.v1/t6

Summary of observed limits on the CP-pdd and CP-even $f_\textrm{M}$ and $f_\textrm{T}$ Wilson coefficients for this analysis and previous results...
Supplementary Figure 1 Left

Data from Supplementary Figure 1 Left

10.17182/hepdata.167352.v1/t7

Observed $p_{T}^{e\mu}$ distributions for events without cut on acoplanarity, and without $N_{tracks}$ cut, using the data from the full Run...
Supplementary Figure 1 Right

Data from Supplementary Figure 1 Right

10.17182/hepdata.167352.v1/t8

Observed $p_{T}^{e\mu}$ distributions for events with 1<=$N_{tracks}$<=5, using the data from the full Run 2 data set. The distributions are...

Figure 1 Left

Figure 1 Right

Figure 2 Left

Figure 2 Right

Figure 3

Figure 4&5

Supplementary Figure 1 Left

Supplementary Figure 1 Right

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