Model-Independent Searches Using Matrix Element Ranking
  Thus far the LHC experiments have yet to discover beyond-the-standard-model physics. This motivates efforts to search for new physics in model independent ways. In this spirit, we describe procedures for using a variant of the Matrix Element Method to search for new physics without regard to a specific signal hypothesis. To make the resulting variables more intuitive, we also describe how these variables can be "flattened", which makes the resulting distributions more visually meaningful. 
Dipsikha Debnath, James S. Gainer, Konstantin T. Matchev
hep-ph hep-ex