Combinations of single-top-quark production cross-section measurements and |ƒ<sub>LV</sub>V<sub>tb</sub>| determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments
This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s√ = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb⁻¹ at s√ = 7 TeV and 12.2 to 20.3 fb⁻¹ at s√...
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| Autores principales: | , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2019
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125511 |
| Aporte de: |
| Sumario: | This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s√ = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb⁻¹ at s√ = 7 TeV and 12.2 to 20.3 fb⁻¹ at s√ = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at s√ = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at s√ = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 ± 1.4 pb at s√ = 8 TeV. The square of the magnitude of the CKM matrix element V<sub>tb</sub> multiplied by a form factor ƒ<sub>LV</sub> is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |V<sub>td</sub>|, |V<sub>ts</sub>| ≪ |V<sub>tb</sub>|. All the ƒ<sub>LV</sub>V<sub>tb</sub>|² determinations, extracted from individual ratios at s√ = 7 and 8 TeV, are combined, resulting in |ƒ<sub>LV</sub>V<sub>tb</sub>| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions. |
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