Publicação
Measurement of the ttcross section and its ratio to the Z production cross √section using pp collisions at √s=13.6 TeV with the ATLAS detector
| Resumo: | The inclusive top-quark-pair production cross section \( \sigma_{t\bar{t}} \) and its ratio to the \( Z \)-boson production cross section have been measured in proton–proton collisions at \( \sqrt{s} = 13.6 \) TeV, using 29 fb\(^{-1}\) of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and \( b \)-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be \( \sigma_{t\bar{t}} = 850 \pm 3(\text{stat.}) \pm 18(\text{syst.}) \pm 20(\text{lumi.}) \) pb. The ratio of the \( t\bar{t} \) and the \( Z \)-boson production cross sections is also measured, where the \( Z \)-boson contribution is determined for inclusive \( e^+e^- \) and \( \mu^+\mu^- \) events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the \( t\bar{t} \) cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, \( R_{t\bar{t}/Z} = 1.145 \pm 0.003(\text{stat.}) \pm 0.021(\text{syst.}) \pm 0.002(\text{lumi.}) \) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The inclusive top-quark-pair production cross section \( \sigma_{t\bar{t}} \) and its ratio to the \( Z \)-boson production cross section have been measured in proton–proton collisions at \( \sqrt{s} = 13.6 \) TeV, using 29 fb\(^{-1}\) of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and \( b \)-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be \( \sigma_{t\bar{t}} = 850 \pm 3(\text{stat.}) \pm 18(\text{syst.}) \pm 20(\text{lumi.}) \) pb. The ratio of the \( t\bar{t} \) and the \( Z \)-boson production cross sections is also measured, where the \( Z \)-boson contribution is determined for inclusive \( e^+e^- \) and \( \mu^+\mu^- \) events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the \( t\bar{t} \) cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, \( R_{t\bar{t}/Z} = 1.145 \pm 0.003(\text{stat.}) \pm 0.021(\text{syst.}) \pm 0.002(\text{lumi.}) \) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set. |
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