DOI: 10.17182/hepdata.78400.v1/t3
title: "Table 3" of "Study of $WW\gamma$ and $WZ\gamma$ production in $pp$ collisions at $\sqrt{s} = 8$ TeV and search for anomalous quartic gauge couplings with the ATLAS experiment"

description: Observed and expected cross-section upper limits at 95\% CL using the CL$_{\text{s}}$ method for the different final states with the photon \et threshold optimised for maximal aQGC sensitivity. The expected cross-section limits are computed assuming the absence of $WV\gamma$ production. The last column shows the theory prediction for the SM signal cross-section computed with the VBFNLO generator and corrected to particle level. The $\ell \nu jj \gamma$ cross-section corresponds to the average cross-section per lepton flavour in the semileptonic analysis and all events of the $e \nu jj \gamma$ and $\mu\nu jj \gamma$ final states are employed for the determination of this limit.
description: CERN-LHC. This paper presents a study of $WW\gamma$ and $WZ\gamma$ triboson production using events from proton--proton collisions at a centre-of-mass energy of $\sqrt{s} = 8$ TeV recorded with the ATLAS detector at the LHC and corresponding to an integrated luminosity of 20.2 fb$^{-1}$. The $WW\gamma$ production cross-section is determined using a final state containing an electron, a muon, a photon, and neutrinos ($e\nu\mu\nu\gamma$). Upper limits on the production cross-section of the $e\nu\mu\nu\gamma$ final state and the $WW\gamma$ and $WZ\gamma$ final states containing an electron or a muon, two jets, a photon, and a neutrino ($e\nu jj\gamma$ or $\mu\nu jj\gamma$) are also derived. The results are compared to the cross-sections predicted by the Standard Model at next-to-leading order in the strong-coupling constant. In addition, upper limits on the production cross-sections are derived in a fiducial region optimised for a search for new physics beyond the Standard Model. The results are interpreted in the context of anomalous quartic gauge couplings using an effective field theory. Confidence intervals at 95% confidence level are derived for the 14 coupling coefficients to which $WW\gamma$ and $WZ\gamma$ production are sensitive. 

The $e\nu\mu\nu\gamma$ fiducial phase space region is defined as (Table 3 of the preprint):
- 1 electron and 1 muon with opposite charge and $p_{\text{T}}^{\ell} &gt; \mbox{20 GeV} $ each
- no $3^{\text{rd}}$ lepton ($p_{\text{T}}^{\ell} &gt; \mbox{7 GeV}$)
- $\eta^{\ell} &lt; 2.5$
- $\Delta R (\ell, \ell^{\prime}) &lt; 0.1$
- at least one photon with $E_{\text{T}}^{\gamma} &gt; \mbox{15 GeV}$ and $|\eta^{\gamma}| &lt; 2.37$
- isolation fraction $\epsilon_{h}^{p} &lt; 0.5$
- $\Delta R(\ell, \gamma) &gt; 0.5$
- $E_{\text{T,rel}}^{\text{miss}} &gt; \mbox{15 GeV}$ 
- $m_{e\mu}&gt; \mbox{50 GeV}$ 
- $N_{\text{jets}} = 0$ with $p_{\text{T}}^{j} &gt; \mbox{25 GeV}$ and $|y^{j}| &lt; 4.4$ 
- $\Delta R(\text{jet}, \gamma) &gt; 0.5$
- $\Delta R(\text{jet}, \ell) &gt; 0.3$

The $\ell\nu jj\gamma$ fiducial phase space region with $\ell = e \text{ or }\mu$ is defined as (Table 3 of the preprint):
- 1 electron or 1 muon with $p_{\text{T}}^{\ell} &gt; \mbox{25 GeV}$ and $|\eta^{\ell}| &lt; 2.5$ 
- no $2^{\text{nd}}$ lepton ($p_{\text{T}}^{\ell} &gt; \mbox{7 GeV}$)
- at least one photon with $E_{\text{T}}^{\gamma} &gt; \mbox{15 GeV}$ and $|\eta^{\gamma}| &lt; 2.37$
- isolation fraction $\epsilon_{h}^{p} &lt; 0.5$
- $\Delta R(\ell, \gamma) &gt; 0.5$
- $E_{\text{T}}^{\text{miss}} &gt; \mbox{30 GeV}$ 
- $m_{\text{T}} &gt; \mbox{30 GeV}$
- at least two jets with $p_{\text{T}}^{j} &gt; \mbox{25 GeV}$ and $|\eta^{j}| &lt; 2.5 $
- $N_{\text{$b$-jets}} = 0$
- $|\Delta \eta_{jj}| &lt; 1.2$
- $\Delta R_{jj} &lt; 3.0$ 
- $\mbox{70 GeV} &lt; m_{jj} &lt; \mbox{100 GeV}$
- $\Delta R(\text{jet}, \gamma) &gt; 0.5$
- $\Delta R(\text{jet}, \ell) &gt; 0.3$