Accurate mass determinations in decay chains with missing energy: II

We discuss kinematic methods for determining the masses of the particles in events at a hadron collider in which a pair of identical particles is produced with each decaying via a series of on shell intermediate beyond-the-standard model (BSM) particles to visible standard model (SM) particles and an invisible particle (schematically, pp→ZZ+jets with Z→Aa→Bba→Ccba→→cba+N where a,b,c, are visible SM particles or groups of SM particles, A,B,C, are on shell BSM particles, and N is invisible). This topology arises in many models including supersymmetry (SUSY) processes such as squark and gluino pair production and decay. We present the detailed procedure for the case of Z→3 visible particles+N and demonstrate that the masses obtained from the kinematic procedure are independent of the model by comparing SUSY to universal extra dimensions.