  We propose a new mass reconstruction technique for SUSY processes at the LHC.
The idea is to completely solve the kinematics of the SUSY cascade decay by
using the assumption that the selected events satisfy the same mass shell
conditions of the sparticles involved in the cascade decay. Using this
technique, we study the measurement of the mass of the bottom squarks in the
cascade decay of the gluino. Based on the final state including two high p_T
leptons and two b-jets, we investigate different possible approaches to the
mass reconstruction of the gluino and the two bottom squarks. In particular we
evaluate the performance of different algorithms in discriminating two bottom
squark states with a mass difference as low as 5%.
