PRECISION SUSY MEASUREMENTS AT CERN LHC

If supersymmetry exists at the electroweak scale, then it should be di scovered at the CERN Large Hadron Collider (LHC). Determining masses o f supersymmetric particles, however, is more difficult. In this paper, methods are discussed to determine combinations of masses and of bran ching ratios precisely from experimentally observable distributions. I n many cases such measurements alone can greatly constrain the particu lar supersymmetric model and determine its parameters with an accuracy of a few percent. Most of the results shown correspond to one year of running at LHC at ''low luminosity,'' 10(33) cm(-2)s(-1).