Measurement of top quark properties in single top production

Single top topologies are exploited for studies of top quark properties. This includes the first measurement of single top polarization in the t-channel production mode in pp collisions, which directly confirms the V-A nature of the tWb production vertex. W-helicity fractions are measured in the phase space sampled by a selection optimized for t-channel single top production, orthogonal to the $\mathrm{t \bar t}$ final states used in traditional measurements of these properties. Anomalous $\mathrm{tu(c)\gamma}$ and $\mathrm{tu(c)g}$ couplings of the top quark are searched for in t-channel single top production with multivariate analyses.