Observation of $WZγ$ Production in $pp$ Collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866929221670010880 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | This Letter reports the observation of $WZγ$ production and a measurement of its cross-section using 140.1 $\pm$ 1.2 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The $WZγ$ production cross-section, with both the $W$ and $Z$ bosons decaying leptonically, $pp \rightarrow WZγ\rightarrow {\ell'}^{\pm}ν\ell^{+}\ell^{-}γ$ ($\ell^{(')} = e, μ$), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross-section is found to be 2.01 $\pm$ 0.30 (stat.) $\pm$ 0.16 (syst) fb. The corresponding Standard Model predicted cross-section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50 $\pm$ 0.06 fb. The observed significance of the $WZγ$ signal is 6.3$σ$, compared with an expected significance of 5.0$σ$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_16994 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of $WZγ$ Production in $pp$ Collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector ATLAS Collaboration High Energy Physics - Experiment This Letter reports the observation of $WZγ$ production and a measurement of its cross-section using 140.1 $\pm$ 1.2 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The $WZγ$ production cross-section, with both the $W$ and $Z$ bosons decaying leptonically, $pp \rightarrow WZγ\rightarrow {\ell'}^{\pm}ν\ell^{+}\ell^{-}γ$ ($\ell^{(')} = e, μ$), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross-section is found to be 2.01 $\pm$ 0.30 (stat.) $\pm$ 0.16 (syst) fb. The corresponding Standard Model predicted cross-section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50 $\pm$ 0.06 fb. The observed significance of the $WZγ$ signal is 6.3$σ$, compared with an expected significance of 5.0$σ$. |
| title | Observation of $WZγ$ Production in $pp$ Collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2305.16994 |