학술논문
Measurement of t-channel production of single top quarks and antiquarks in pp collisions at 13 TeV using the full ATLAS Run 2 data sample
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2024(5)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: The production of single top quarks and top antiquarks via the t-channel exchange of a virtual W boson is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV at the LHC using 140 fb−1 of ATLAS data. The total cross-sections are determined to be σtq=137−8+8σt¯q=84−5+6σtq+t¯q=221−13+13Rt=σtq/σt¯q=1.636−0.034+0.036−0.37t using different sets of parton distribution functions is compared with the measured value, demonstrating the potential to further constrain the functions when using this result in global fits. The measured cross-sections are interpreted in an effective field theory approach, setting limits at the 95% confidence level on the strength of a four-quark operator and an operator coupling the third quark generation to the Higgs boson doublet: σtq=137−8+8σt¯q=84−5+6σtq+t¯q=221−13+13Rt=σtq/σt¯q=1.636−0.034+0.036−0.37tb| > 0.95 at the 95% confidence level is derived from the measured value of σtq=137−8+8σt¯q=84−5+6σtq+t¯q=221−13+13Rt=σtq/σt¯q=1.636−0.034+0.036−0.37tb| ≫ |Vtd |, |Vts |. In a more general approach, pairs of CKM matrix elements involving top quarks are simultaneously constrained, leading to confidence contours in the corresponding two-dimensional parameter spaces.