Observation of $W\gamma\gamma$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
Phys.Lett.B 848 (2024) 138400, 2024.

Abstract (data abstract)
This letter reports the observation of $W(\ell\nu)\gamma\gamma$ production in proton-proton collisions. This measurement uses the full Run~2 sample of events recorded at a \com energy of $\sqrt{s} = 13$~TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140~fb$^{-1}$. Events with a leptonically-decaying $W$ boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of $5.6$ standard deviations. The inclusive fiducial production cross section of $W(e\nu)\gamma\gamma$ and $W(\mu\nu)\gamma\gamma$ events is measured to be $\sigma_{\mathrm{fid}} = 13.8 \pm 1.1 (\mathrm{stat}) \substack{+2.1 \\ -2.0} (\mathrm{syst}) \pm 0.1 (\mathrm{lumi})$~fb, in agreement with the Standard Model prediction.

  • Measured and predicted fiducial cross sections

    Figure 3 in the paper

    10.17182/hepdata.144508.v1/t1

    The measured fiducial $W(\rightarrow e\nu / \mu\nu)\gamma\gamma$ integrated cross section compared with both the signal event generator predictions.

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