Comparison of Cut-Based and Matrix Element Method Results for Beyond   Standard Model Quarks
  In this work, two different methods for extracting the mass of a new quark from the (pseudo) data are compared: the classical cut-based method and the matrix element method. As a concrete example a fourth family up type quark is searched in p-p collisions of 7 TeV center of mass energy. We have shown that even with very small number of events, Matrix Element Method gives better estimations for the mass value and its error, especially for event samples in which Signal to Background ratio is greater than 0.2. 
Erdogan Akyazi, Gokhan Unel, Metin Yilmaz
hep-ph