arXiv 0905.11482009-05hep-ph

Gluino NLSP，暗物质通过Gluino共湮灭，和LHC签名

Gluino NLSP, Dark Matter via Gluino Coannihilation, and LHC Signatures

Daniel Feldman, Zuowei Liu, Pran Nath

备注：: 33 pages, 8 figures, accepted for publication in Physical Review D
发表信息：: Phys.Rev.D80:015007,2009
DOI：: 10.1103/PhysRevD.80.015007

摘要：

的可能性，胶子是下一个最轻的超对称粒子（NLSP）进行了讨论，它表明，这种情况下出现在非通用的SUGRA模型的参数空间的一个重要组成部分与所有已知的实验界限兼容。结果表明，至少在前两代中，胶子NLSP（GNLSP）模型导致了一个压缩的sfermion谱，其中slepton通常比squarks重。这里的残余密度是由胶子共湮灭决定的，这是胶子和中性伴子质量之间相对较小的质量分裂的原因。因此，GNLSP类模型是非常有预测性的，首先是因为在LHC的超对称产生截面主要是由胶子产生，其次是因为胶子产生本身主要通过一个单一的通道进行，该通道允许直接确定胶子质量和间接确定中性子质量，因为这两个质量之间的线性关系受到共湮灭的高度约束。对这些模型的详细分析表明，通过适当的切割，可以将胶子产生的喷流和标记的b喷流与标准模型背景区分开来。结果发现，GNLSP模型可以用10 fb $^{-1}$的积分亮度进行测试，因此可以在LHC的第一批数据中用低光度运行进行检查。因此，如果GNLSP模型得以实现，LHC将通过大量生产胶子而变成胶子工厂，而在允许的GNLSP模型参数空间上，由其他生产模式产生的总超对称事件中通常只有一小部分$\lesssim 5%$。

英文摘要：

The possibility that the gluino is the next to the lightest supersymmetric particle (NLSP) is discussed and it is shown that this situation arises in nonuniversal SUGRA models within a significant part of the parameter space compatible with all known experimental bounds. It is then shown that the gluino NLSP (GNLSP) models lead to a compressed sfermion spectrum with the sleptons often heavier than the squarks at least for the first two generations. The relic density here is governed by gluino coannihilation which is responsible for a relatively small mass splitting between the gluino and the neutralino masses. Thus the GNLSP class of models is very predictive first because the SUSY production cross sections at the LHC are dominated by gluino production and second because the gluino production itself proceeds dominantly through a single channel which allows for a direct determination of the gluino mass and an indirect determination of the neutralino mass due to a linear relation between these two masses which is highly constrained by coannihilation. A detailed analysis of these models shows that the jet production and tagged b-jets from the gluino production can be discriminated from the standard model background with appropriate cuts. It is found that the GNLSP models can be tested with just 10 fb$^{-1}$ of integrated luminosity and may therefore be checked with low luminosity runs in the first data at the LHC. Thus if a GNLSP model is realized, the LHC will turn into a gluino factory through a profuse production of gluinos with typically only a small fraction $\lesssim 5%$ of total SUSY events arising from other production modes over the allowed GNLSP model parameter space.

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摘要：

英文摘要：

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