Measurement of differential cross sections and charge ratios for t-channel single top quark production in proton–proton collisions at $$\sqrt{s}=13$$s=13 $$\,\text {Te}\text {V}$$Te
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10052_2020_Article_7858.pdf
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Brandstetter, J.
Dragicevic, M.
Erö, J.
Del Valle, A. E
Flechl, M.
Date Issued
May 6, 2020
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2020 May 06;80(5):370
Version
Final published version
Abstract
Abstract
A measurement is presented of differential cross sections for t-channel single top quark and antiquark production in proton–proton collisions at a centre-of-mass energy of 13$$\,\text {Te}\text {V}$$Te by the CMS experiment at the LHC. From a data set corresponding to an integrated luminosity of 35.9$$\,\text {fb}^{-1}$$fb-1, events containing one muon or electron and two or three jets are analysed. The cross section is measured as a function of the top quark transverse momentum ($$p_{\mathrm{T}} $$pT), rapidity, and polarisation angle, the charged lepton $$p_{\mathrm{T}} $$pT and rapidity, and the $$p_{\mathrm{T}} $$pT of the $$\text {W}{}{}$$W boson from the top quark decay. In addition, the charge ratio is measured differentially as a function of the top quark, charged lepton, and $$\text {W}{}{}$$W boson kinematic observables. The results are found to be in agreement with standard model predictions using various next-to-leading-order event generators and sets of parton distribution functions. Additionally, the spin asymmetry, sensitive to the top quark polarisation, is determined from the differential distribution of the polarisation angle at parton level to be $$0.440 \pm 0.070$$0.440±0.070, in agreement with the standard model prediction.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-020-7858-1
