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arXiv 1202.4448hep-phhep-ex
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通过消失的Chargino轨迹发现LHC-8的Gluino事件

Discovering Gluino Events at LHC-8 via Disappearing Chargino Tracks

Gordon Kane, Ran Lu, Bob Zheng

摘要:

在这篇文章中,我们提出了一种新的方法来识别在LHC上的胶子对产生事件。该方法的动机和工程理论与重方和Wino类LSP(与近简并LSP和chargino)。这样的理论是很有动机的,它们的胶子通常有一个O(50%)的分支比带电Winos。观测由胶子衰变产生的长寿命带电维诺的轨迹可以清楚地识别胶子事件。在对撞机中产生的带电Wino NLSP可以足够长的寿命,在衰变成软π介子(或软轻子)和LSP(具有低SM背景的签名)之前留下可重建的高pT带电轨道。通过补充规范的胶子搜索策略与搜索这些硬电荷轨道,我们的结果表明,它将有可能找到胶子显着较低的光度。此外,我们描述了一个程序,用于获得一个运动学测量的胶子质量使用的三个动量的重建电荷轨道。通过对胶子质量和截面的测量,将有可能确定胶子的自旋,并证实多余的事件确实是由于自旋为1/2的超伴子。也有可能使用这些硬的威诺轨道来获得电荷子质量的近似测量值,从而获得LSP(暗物质)质量。

英文摘要:

In this note, we advocate a new method for identifying gluino pair production events at the LHC. The method is motivated by and works for theories with heavy squarks and Wino-like LSPs (with nearly degenerate LSP and chargino). Such theories are well motivated and their gluinos typically have a O(50%) branching ratio to charged Winos. Observing the track of a long lived charged Wino produced from gluino decay could give a clear identification of a gluino event. Charged Wino NLSPs produced in colliders can be long-lived enough to leave a reconstructable high pT charged track before decaying into a soft pion (or a soft lepton) and the LSP, a signature with low SM background. By supplementing the canonical gluino search strategy with a search for these stiff chargino tracks, our results suggest it will be possible to find gluinos with significantly less luminosity. In addition, we describe a procedure for obtaining a kinematic measurement of the gluino mass using the three momenta of the reconstructed chargino tracks. With measurements of the gluino mass and cross section, it will be possible to determine the gluino spin, and confirm that the excess events are indeed due to a spin 1/2 superpartner. It may also be possible to use these stiff Wino tracks to obtain an approximate measurement of the chargino mass, and therefore the LSP (dark matter) mass.

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。

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