In Standard Model, top quark can be produced via the strong interaction as the top pair. It also allows for top quark to be produced through electroweak interaction as single top quark plus jets, which is referred as single top. The single top production is still an important signal for several reasons. Within the Standard Model, the single-top signal allows a direct measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element Vtb. Furthermore, since the top quark decays before hadronizing, its polarization can be directly observed in the angular correlations of its decay products. It is very valuable to continue these measurements after the discovery.

In CDF, we used MadEvent for generating single top Monte Carlo samples. But we need to do a matching procedure for the single top t-channel. MadEvent samples had been used commonly in single top search and lead to the first observation in CDF. However, for more precise measurement of Vtb or top properties, MadEvent samples may not be accurate enough. Instead of MadEvent, The idea is to use a NLO generator – POWHEG for single top samples. With NLO accuracy and avoiding the matching procedure, POWHEG samples of single top can be used for precise measurements. The previous neglected single top channel, associated Wt channel, is also available in POWHEG, which allows us to study this channel for the very first time. After comprehensive studies of POWHEG samples, we will use it for the single top cross section measurement. We will improve our Neural-Network analysis by adding new lepton type, new input variables and train it for new top mass 172.5 GeV. When we get the result of the single top cross section, it would allow us to extract the Vtb value and study different top properties.