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arXiv 1209.0231hep-ph
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用Mono-Z在LHC上寻找暗物质

Searching for Dark Matter at the LHC with a Mono-Z

Nicole F. Bell, James B. Dent, Ahmad J. Galea, Thomas D. Jacques, Lawrence M. Krauss, Thomas J. Weiler

摘要:

我们调查的单Z过程作为一个潜在的暗物质搜索策略在大型强子对撞机。在这个通道中,一个Z玻色子因缺少横向动量而反弹,这是由暗物质粒子$χ$造成的,它会逃离探测器。该检索策略与monojet和Dahoton检索相关并相互补充。为了说明的目的,我们考虑在玩具暗物质模型中的$q\bar{q} -> χχZ$过程,其中Z玻色子从初始状态夸克或从内部传播子发射。这个过程的特征之一是一对具有高pT的μ子,它们重建为Z的不变质量,以及大量丢失的横向能量。作为一个纯粹的电弱信号,QCD和其他标准模型的背景是相对容易去除适度的选择削减。我们比较信号的标准模型的背景和证明,即使是保守的削减,存在的参数空间区域,在未来的大型强子对撞机数据的信号可能是清晰可见的背景以上,允许新的发现潜力或补充信息的可能性,黑暗部门以外的其他可观察的渠道。

英文摘要:

We investigate a mono-Z process as a potential dark matter search strategy at the LHC. In this channel a single Z boson recoils against missing transverse momentum, attributed to dark matter particles, $χ$, which escape the detector. This search strategy is related, and complementary to, monojet and monophoton searches. For illustrative purposes we consider the process $q\bar{q} -> χχZ$ in a toy dark matter model, where the Z boson is emitted from either the initial state quarks, or from the internal propagator. Among the signatures of this process will be a pair of muons with high pT that reconstruct to the invariant mass of the Z, and large amounts of missing transverse energy. Being a purely electroweak signal, QCD and other Standard Model backgrounds are relatively easily removed with modest selection cuts. We compare the signal to Standard Model backgrounds and demonstrate that, even for conservative cuts, there exist regions of parameter space where the signal may be clearly visible above background in future LHC data, allowing either new discovery potential or the possibility of supplementing information about the dark sector beyond that available from other observable channels.

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