#### ${{\boldsymbol t}}$-quark Polarization in Single Top Events in ${{\boldsymbol p}}{{\boldsymbol p}}$ Collisions at $\sqrt {s }$ = 13 TeV

VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$0.440$ $\pm0.070$ 1
 2020 R
CMS (${{\mathit \alpha}_{{{{\mathit \ell}}}}}\mathit P$)/2; t-channel
 1 SIRUNYAN 2020R based on 36.1 fb${}^{-1}$ of data. Differential cross sections for $\mathit t$-channel single top production are measured using 1${{\mathit \ell}}$ + 2,3-jet mode and found to be in good agreement with SM predictions. The value is the top spin asymmetry, given by 1/2 of the spin analyzing power ${{\mathit \alpha}_{{{{\mathit \ell}}}}}$ (=1 at LO of SM) times the top polarization $\mathit P$, where the spin axis is defined as the direction of the spectator quark in the top rest frame at the parton level. It is in good agreement with the NLO SM prediction of 0.436.
References:
 SIRUNYAN 2020R
EPJ C80 370 Measurement of differential cross sections and charge ratios for t-channel single top quark production in proton?proton collisions at $\sqrt{s}=13\,\text {Te}\text {V}$