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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. Sanders, Stephen J. The ATLAS collaboration
Aaboud, M.
Sanders, Stephen J.
The ATLAS collaboration
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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.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
Date
2019-05-16
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Springer Verlag
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Hadron-Hadron scattering (experiments)
Citation
The ATLAS collaboration., Aaboud, M., Aad, G. et al. Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at √𝑠 = 7 and 8 TeV with the ATLAS and CMS experiments. J. High Energ. Phys. 2019, 88 (2019). https://doi.org/10.1007/JHEP05(2019)088