WEXTER and ERAFITTER: two programs to fit M_W at LEP2 using the best   measurable kinematical variables
  In this paper, we present two programs to fit M_W at LEP2 using the best measurable kinematical variables. The theoretical probabilities of observing the final-state kinematical configurations are computed by integrating over the quantities that are not well measured. Therefore, an event-by-event kinematical reconstruction is avoided. M_W is then determined through a maximum likelihood fit. 
F. A. Berends (University of Leiden), C. G. Papadopoulos (Democritos   Nuclear Research Center), R. Pittau (CERN)