Observation of a spinning top at the LHC

The LHC and the ATLAS detector will enable us to carry out precision measurements of the top quark properties very shortly after the~ startup, and we will be searching for deviations from the standard model~ prediction at the energy scale close to electro-weak symmetry breaking. The single~ top production provides us with a unique opportunity to study the spin properties~of the top production bWt vertex, where maximal polarization is predicted by~ the SM through the V-A coupling. Due to its massiveness, the top decays~ before hadronization and its spin information is directly propagated to~ the decay products. Therefore, in this analysis, the top quark is~ reconstructed using a kinematic fit and the polarization is measured using a template~ method. Results using the Atlas full-simulation samples will be shown. The focus is on understanding the effect of background from W+jets events using the latest MC generators.