Minimal Kinematic Constraints and MT2

Details Minimal Kinematic Constraints and MT2 Minimal Kinematic Constraints and MT2

2008-10-29

arxiv.org/abs/0810.5178v2

JHEP 0812:063,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in JHEP

Scientific paper

10.1088/1126-6708/2008/12/063

We clarify the relation between the variable MT2 and the method of kinematic constraints, both of which can be used for mass determination in events with two missing (dark matter) particles at hadron colliders. We identify a set of minimal kinematic constraints, including the mass shell conditions for the missing particles and their mother particles, as well as the constraint from the measured missing transverse momentum. We show that MT2 is the boundary of the mass region consistent with the minimal constraints. From this point of view, we also obtained a more efficient algorithm for calculating MT2. When more constraints are available in the events, we can develop more sophisticated mass determination methods starting from the MT2 constraint. In particular, we discuss cases when each decay chain contains two visible particles.

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