RECO级\sqrt{s}_{min}和子系统\sqrt{s}_{min}：改进的测量强子对撞机丢失能量事件中新物理质量标度的全局包容变量
RECO level \sqrt{s}_{min} and subsystem \sqrt{s}_{min}: improved global inclusive variables for measuring the new physics mass scale in missing energy events at hadron colliders
摘要：
变量\sqrt{s}_{min}最初在arXiv：0812.1042中提出，作为强子对撞机缺失能量事件中新物理质量标度的模型独立、全局和完全包容的度量。然而，在最初的\sqrt{s}_{min}中，与新物理质量标度的联系被潜在事件的影响所模糊，最明显的是初始状态辐射和多个部分子相互作用。在本文中，我们提出了两个改进的变体的\sqrt{s}_{min}变量，克服了这个问题。首先，我们表明，通过评估的\sqrt{s}_{min}变量在RECO水平，在事件中的重建对象，从底层事件的影响显着减少和良好的相关性之间的峰值在\sqrt{s}_{min}^{(reco)}分布和新的物理质量尺度被恢复。其次，当\sqrt{s}_{min}概念应用于不涉及任何QCD喷流的事件子系统时，可以完全避免潜在的事件问题。我们提供了一个分析公式的子系统\sqrt{s}_{min}^{(sub)}变量，并表明其峰值具有通常的相关性与子系统中产生的粒子的质量尺度。最后，我们将\sqrt{s}_{min}与其他流行的包含变量，如H_T，M_{Tgen}和M_{TTgen}进行了比较。我们用几个超对称的例子和顶夸克对产生的双轻子事件来说明我们的讨论。
英文摘要：
The variable \sqrt{s}_{min} was originally proposed in arXiv:0812.1042 as a model-independent, global and fully inclusive measure of the new physics mass scale in missing energy events at hadron colliders. In the original incarnation of \sqrt{s}_{min}, however, the connection to the new physics mass scale was blurred by the effects of the underlying event, most notably initial state radiation and multiple parton interactions. In this paper we advertize two improved variants of the \sqrt{s}_{min} variable, which overcome this problem. First we show that by evaluating the \sqrt{s}_{min} variable at the RECO level, in terms of the reconstructed objects in the event, the effects from the underlying event are significantly diminished and the nice correlation between the peak in the \sqrt{s}_{min}^{(reco)} distribution and the new physics mass scale is restored. Secondly, the underlying event problem can be avoided altogether when the \sqrt{s}_{min} concept is applied to a subsystem of the event which does not involve any QCD jets. We supply an analytic formula for the resulting subsystem \sqrt{s}_{min}^{(sub)} variable and show that its peak exhibits the usual correlation with the mass scale of the particles produced in the subsystem. Finally, we contrast \sqrt{s}_{min} to other popular inclusive variables such as H_T, M_{Tgen} and M_{TTgen}. We illustrate our discussion with several examples from supersymmetry, and with dilepton events from top quark pair production.
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