Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s √s = 7 and 8 TeV with the ATLAS and CMS experiments
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Aaboud2019_Article_CombinationsOFSingle-top-quark.pdf
Description
Published version
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1.13 MB
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Adobe PDF
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694351ae42c2f6c8443debc075893d39
Author(s)
ATLAS Collaboration
CMS Collaboration
Abercrombie, Daniel Robert
Allen, B.
Azzolini, Virginia
Baty, Austin Alan
Bi, R.
Brandt, S.
Busza, Wit
Cali, Ivan Amos
Date Issued
May 2019
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
ATLAS Collaboration and CMS Collaboration (Aaboud, M., et al.), "Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s √s = 7 and 8 TeV with the ATLAS and CMS experiments." Journal of High Energy Physics 2019 (May 2019): no. 88 doi 10.1007/JHEP05(2019)088 ©2019 Author(s)
Version
Final published version
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.].
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1007/JHEP05(2019)088
