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Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s√ = 7 and 8 TeV with the ATLAS and CMS experiments

Aaboud, M; Aad, G; Abbott, B; Abbott, DC; Abdinov, O; Abed Abud, A; Abhayasinghe, DK; ... Araujo Ferraz, V; + view all (2019) Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s√ = 7 and 8 TeV with the ATLAS and CMS experiments. Journal of High Energy Physics , 2019 , Article 88. 10.1007/JHEP05(2019)088. Green open access

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Abstract

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 Vtb multiplied by a form factor fLV 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 |Vtd|, |Vts| ≪ |Vtb|. All the |fLVVtb|2 determinations, extracted from individual ratios at s = 7 and 8 TeV, are combined, resulting in |fLVVtb| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.[Figure not available: see fulltext.].

Type: Article
Title: Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s√ = 7 and 8 TeV with the ATLAS and CMS experiments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/JHEP05(2019)088
Publisher version: https://doi.org/10.1007/JHEP05(2019)088
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Hadron-Hadron scattering (experiments)
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10075948
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