Observation of $Wγγ$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
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arXiv
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866914642868043776 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | This letter reports the observation of $W(\ellν)γγ$ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center-of-mass 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 $W(eν)γγ$ and $W(μν)γγ$ events is measured to be $σ_{\mathrm{fid}} = 13.8 \pm 1.1 (\mathrm{stat}) \substack{+2.1 \\ -2.0} (\mathrm{syst}) \pm 0.1 (\mathrm{lumi})$ fb, in agreement with the Standard Model prediction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_03041 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of $Wγγ$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment This letter reports the observation of $W(\ellν)γγ$ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center-of-mass 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 $W(eν)γγ$ and $W(μν)γγ$ events is measured to be $σ_{\mathrm{fid}} = 13.8 \pm 1.1 (\mathrm{stat}) \substack{+2.1 \\ -2.0} (\mathrm{syst}) \pm 0.1 (\mathrm{lumi})$ fb, in agreement with the Standard Model prediction. |
| title | Observation of $Wγγ$ triboson production in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2308.03041 |