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arXiv 0908.2446hep-phhep-exhep-th
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球形粒子的顶点位移：在LHC上检验Lee-Wick标准模型

Vertex Displacements for Acausal Particles: Testing the Lee-Wick Standard Model at the LHC

Ezequiel Alvarez, Leandro Da Rold, Carlos Schat, Alejandro Szynkman

备注：
29 pages, 7 figures, minor changes, published version
发表信息：
JHEP 0910:023,2009
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摘要：

我们建议寻找错误的位移顶点，其中次级顶点的衰变产物移向主顶点，而不是远离它，作为微观违反因果关系的签名。我们详细分析了最近提出的Lee-Wick标准模型的轻子部分，它提供了一个很好的动机框架来研究因果效应。我们发现，假设最小味违反，电子的李-威克伙伴，{ \tilde 1}^e和\tilde e，可以在LHC上产生可测量的错误顶点，最有希望的通道是q \bar{q} --> \bar{\tilde l}^e { \tilde 1}^e --> e^+ e^- jjjj。利用MadGraph/MadEvent进行的蒙特卡罗模拟表明，当M_1 < 450 GeV时，在LHC时代应该可以测量这些非因果顶点位移。

英文摘要：

We propose to search for wrong displaced vertices, where decay products of the secondary vertex move towards the primary vertex instead of away from it, as a signature for microscopic violation of causality. We analyze in detail the leptonic sector of the recently proposed Lee-Wick Standard Model, which provides a well motivated framework to study acausal effects. We find that, assuming Minimal Flavor Violation, the Lee-Wick partners of the electron, {\tilde l}^e and \tilde e, can produce measurable wrong vertices at the LHC, the most promising channel being q \bar{q} --> \bar{\tilde l}^e {\tilde l}^e --> e^+ e^- jjjj. A Monte-Carlo simulation using MadGraph/MadEvent suggests that for M_l < 450 GeV the measurement of these acausal vertex displacements should be accessible in the LHC era.

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