Measurement of Masses in the System by Kinematic Endpoints in pp Collisions at = 7 TeV
A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb(−1) collected by the CMS experiment in pp collisions at . The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.