NLO vector-boson production matched with shower in POWHEG
  We present a next-to-leading-order calculation of W/Z production interfaced to shower Monte Carlo, implemented according to the POWHEG method. Finite width effects, Z/gamma interference and angular correlations of decay products are included. A detailed comparison with MC@NLO and PYTHIA is carried out. 
Simone Alioli, Paolo Nason, Carlo Oleari, Emanuele Re