Measurement of the Neutralino Mass

Should R-parity conserving supersymmetry (SUSY) be observed at the LHC, the presence in every signal event of two invisible Lightest Supersymmetric Particles (LSPs) will prevent direct reconstruction of the masses of SUSY states. In order to solve this problem techniques have been developed which use thresholds and end-points in invariant mass spectra to constrain combinations of SUSY masses. In this paper the application of such techniques to low mass SUSY models with light sleptons will be described, with a particular emphasis on the measurement of the lightest neutralino LSP mass.