用一维分解的MT2测量超伴子质量
Superpartner mass measurements with 1D decomposed MT2
摘要：
我们提出了一种新的模型无关的质量测量技术在强子对撞机丢失的能量事件。我们说明我们的方法与最具挑战性的情况下，一个短的，单步衰减链。我们考虑了超对称性中包含的同号电荷对的产生，然后是轻子衰变到中微子。我们引入了剑桥MT 2变量的两个一维分解：MT 2_ \parallel和MT 2_ \perp，分别在上游横向动量PT方向和与之正交的方向上.我们表明，可以通过最小化事件的数量N，其中MT 2超过一定的阈值，方便地测量从端点MT 2 ^max_ \perp的sneutrino质量可以直接测量。
英文摘要：
We propose a new model-independent technique for mass measurements in missing energy events at hadron colliders. We illustrate our method with the most challenging case of a short, single-step decay chain. We consider inclusive same-sign chargino pair production in supersymmetry, followed by leptonic decays to sneutrinos. We introduce two one-dimensional decompositions of the Cambridge MT2 variable: MT2_\parallel and MT2_\perp, on the direction of the upstream transverse momentum PT and the direction orthogonal to it, respectively. We show that the sneutrino mass can be measured directly by minimizing the number of events N in which MT2 exceeds a certain threshold, conveniently measured from the endpoint MT2^max_\perp.
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