Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at √s = 7 and 8 TeV with the ATLAS and CMS experiments
Date
2019
Authors
Aaboud, M.
Aad, G.
Abbott, B.
Abbott, D.C.
Abdinov, O.
Abed Abud, A.
Abhayasinghe, D.K.
Abidi, S.H.
AbouZeid, O.S
Abraham, N.L
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of High Energy Physics
Abstract
This 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.
Description
Keywords
Hadron-Hadron scattering (experiments)
Citation
Aaboud, 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)088