Publicação
Measurement of t-channel single-top-quark production in pp collisions at √s=5.02 TeV with the ATLAS detector
| Resumo: | The observation of the electroweak production of single-top-quarks is made using 255 pb\(^{-1}\) of proton-proton collision data recorded at \(\sqrt{s} = 5.02\) TeV with the ATLAS detector at the Large Hadron Collider. An event selection is used to identify single-top-quark candidates arising from \( t \)-channel production with the top quark decaying semi-leptonically. Events passing the selection are then used to measure the inclusive cross-section for the combined production of single-top-quarks and antiquarks, \( \sigma(tq + t\bar{q}) \), and the ratio \( R_t \) between these two. They are measured to be \( \sigma(tq + t\bar{q}) = 27.1^{+4.4}_{-4.1}(\text{stat.})^{+4.4}_{-3.7}(\text{syst.}) \) pb and \( R_t = 2.73^{+1.43}_{-0.82}(\text{stat.})^{+1.01}_{-0.29}(\text{syst.}) \). The individual single-top-quark (\( tq \)) and single-top-antiquark (\( t\bar{q} \)) production cross-sections are measured to be \( \sigma(tq) = 19.8^{+3.9}_{-3.1}(\text{stat.})^{+2.9}_{-2.2}(\text{syst.}) \) pb and \( \sigma(t\bar{q}) = 7.3^{+3.2}_{-2.1}(\text{stat.})^{+2.8}_{-1.5}(\text{syst.}) \) pb. All measurements are in good agreement with the Standard Model predictions. |
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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 observation of the electroweak production of single-top-quarks is made using 255 pb\(^{-1}\) of proton-proton collision data recorded at \(\sqrt{s} = 5.02\) TeV with the ATLAS detector at the Large Hadron Collider. An event selection is used to identify single-top-quark candidates arising from \( t \)-channel production with the top quark decaying semi-leptonically. Events passing the selection are then used to measure the inclusive cross-section for the combined production of single-top-quarks and antiquarks, \( \sigma(tq + t\bar{q}) \), and the ratio \( R_t \) between these two. They are measured to be \( \sigma(tq + t\bar{q}) = 27.1^{+4.4}_{-4.1}(\text{stat.})^{+4.4}_{-3.7}(\text{syst.}) \) pb and \( R_t = 2.73^{+1.43}_{-0.82}(\text{stat.})^{+1.01}_{-0.29}(\text{syst.}) \). The individual single-top-quark (\( tq \)) and single-top-antiquark (\( t\bar{q} \)) production cross-sections are measured to be \( \sigma(tq) = 19.8^{+3.9}_{-3.1}(\text{stat.})^{+2.9}_{-2.2}(\text{syst.}) \) pb and \( \sigma(t\bar{q}) = 7.3^{+3.2}_{-2.1}(\text{stat.})^{+2.8}_{-1.5}(\text{syst.}) \) pb. All measurements are in good agreement with the Standard Model predictions. |
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