Mass Determination in Cascade Decays Using Shape Formulas
  In SUSY scenarios with invisible LSP, sparticle masses can be determined from fits to the endpoints of invariant mass distributions. Here we discuss possible improvements by using the shapes of the distributions. Positive results are found for multiple-minima situations and for mass regions where the endpoints do not contain sufficient information to obtain the masses. 
B. K. Gjelsten, D. J. Miller, P. Osland, A. R. Raklev