Aaboud, M.Aad, G.Abbott, B.Abbott, D.C.Abdinov, O.Abed Abud, A.Abhayasinghe, D.K.Abidi, S.H.AbouZeid, O.SAbraham, N.LAlbert, JAnelli, C. RChiu, Y. HGhasemi Bostanabad, MHamano, KHill, EKay, E. FKeeler, RKowalewski, RLefebvre, Met al.2020-10-132020-10-1320192019Aaboud, M., Aad, G., Abbott, B., Abbott, D.C., Abdinov, O., Abed Abud, A., … Zwalinski, L. (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(5) https://doi.org/10.1007/JHEP05(2019)088https://doi.org/10.1007/JHEP05(2019)088http://hdl.handle.net/1828/12197This paper presents the combinations of single-top-quark production crosssection 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: tchannel, 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 schannel 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.enHadron-Hadron scattering (experiments)ArticleDepartment of Physics and Astronomy