CMS-PAS-TOP-17-011

CMS-PAS-TOP-17-011
Measurement of the single top quark and antiquark production cross sections in the $t$ channel and their ratio in pp collisions at $\sqrt{s} =$ 13 TeV
CMS Collaboration
July 2018

Abstract: The cross sections for the production of single top quarks and antiquarks in the $t$ channel, and their ratio, are measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The full data set recorded in 2016 by the CMS detector at the LHC is analyzed, corresponding to an integrated luminosity of 35.9 fb $^{-1}$ . Events with one muon or electron and two jets are selected, where one of the two jets is identified as originating from a bottom quark. A multivariate discriminator exploiting several kinematic variables is applied to separate signal from background events. The ratio $R_{t\mathrm{\text{-}ch.}}$ of the cross sections is measured to be 1.65 $\pm$ 0.02 (stat) $\pm$ 0.04 (syst). The total cross section for the production of single top quarks or antiquarks is measured to be 219.0 $\pm$ 1.5 (stat) $\pm$ 33.0 (syst) pb and the absolute value of the CKM matrix element $V_{\mathrm{tb}}$ is determined to be 1.00 $\pm$ 0.05 (exp) $\pm$ 0.02 (theo). All results are in agreement with the standard model predictions.
Links: CDS record (PDF) ; inSPIRE record ; HepData record ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 800 (2019) 135042. The superseded preliminary plots can be found here.

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