arXiv 0712.09432007-12hep-ph

强子对撞机上新态的质量测定

Mass Determination of New States at Hadron Colliders

Graham G. Ross, Mario Serna

备注：: Minor corrections. 10 pages, 6 figures. Clarrified behavior under ISR
发表信息：: Phys.Lett.B665:212-218,2008
DOI：: 10.1016/j.physletb.2008.06.003

摘要：

我们提出了一种改进的方法强子对撞机质量测定的新的状态，衰变到一个大规模的，长寿命的状态，如LSP在MSSM。重点研究了三体衰变产生的新态和新的长寿命的不可见态。我们的方法是构造一个运动学量，它强制执行系统上所有已知的物理约束。为观测到的事件计算的这个量的分布有一个端点，它决定了新状态的质量。然而，我们发现通过拟合整个分布而不仅仅是端点来确定质量要有效得多。我们认为，在LHC的各种模型的方法的应用程序，并证明该方法可以确定的质量在约6 GeV内，仅使用250个事件。这意味着该方法即使对于LHC中相对罕见的过程也是可行的，例如中性伴子对的产生。

英文摘要：

We propose an improved method for hadron-collider mass determination of new states that decay to a massive, long-lived state like the LSP in the MSSM. We focus on pair produced new states which undergo three-body decay to a pair of visible particles and the new invisible long-lived state. Our approach is to construct a kinematic quantity which enforces all known physical constraints on the system. The distribution of this quantity calculated for the observed events has an endpoint that determines the mass of the new states. However we find it much more efficient to determine the masses by fitting to the entire distribution and not just the end point. We consider the application of the method at the LHC for various models and demonstrate that the method can determine the masses within about 6 GeV using only 250 events. This implies the method is viable even for relatively rare processes at the LHC such as neutralino pair production.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文