最小运动学约束与MT2
Minimal Kinematic Constraints and MT2
摘要：
我们澄清变量MT 2和运动学约束的方法之间的关系，这两种方法都可以用于在强子对撞机上的事件与两个失踪（暗物质）的质量确定。我们确定了一组最小的运动学约束，包括失踪的粒子和它们的母粒子的质量壳条件，以及从测量失踪的横向动量的约束。我们表明，MT2的质量区域的边界与最小的约束。从这个角度出发，我们也得到了一个计算MT2的更有效的算法。当事件中有更多的约束时，我们可以从MT2约束开始开发更复杂的质量确定方法。特别是，我们讨论的情况下，每个衰变链包含两个可见粒子。
英文摘要：
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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