arXiv 1107.20482011-07hep-phhep-ex

LHC暗物质信号和光子相关产生的次领先级QCD预测

Next-to-leading order QCD predictions for the signal of Dark Matter and photon associated production at the LHC

Jian Wang, Chong Sheng Li, Ding Yu Shao, Hao Zhang

备注：: 20 pages, 14 figures, version published in Phys.Rev.D
发表信息：: Phys. Rev. D 84, 075011 (2011)
DOI：: 10.1103/PhysRevD.84.075011

摘要：

我们研究了LHC发现暗物质信号的可能性，其中包括六维有效算符诱导的光子伴随产生，包括非线性光学QCD修正。我们研究了SM的主要背景，即$Z$玻色子和光子伴随产生的$Z$玻色子的不可见dacay，以及$Z$玻色子和喷流伴随产生的喷流被误认为光子。我们发现，随着光子横动量的增加，背景的$p_T^γ$分布比信号的分布减小得快。背景的$η^γ$分布在$η^γ$的整个范围内几乎是平坦的。相反，信号主要位于$η^γ$的中心区域。这些特征可能有助于在实验中选择事件。我们表明，在参数空间所允许的遗迹丰度约束，我们已经计算出在NLO QCD水平，LHC与$\sqrt{S}=7{\rm TeV}$可能会发现这个信号在$5σ$水平后，收集的积分光度的$1 {\rm fb}^{-1}$。另一方面，如果在大型强子对撞机上没有观察到这种信号，我们可以在$3σ$水平上为新的物理尺度设定一个下限。

英文摘要：

We study the potential of LHC to discovery the signal of Dark Matter with photon associated production induced by a dimension six effective operator, including NLO QCD corrections. We investigate the main backgrounds from SM, i.e. $Z$ boson and a photon associated production with invisible dacay of $Z$ boson, and $Z$ boson and a jet production with the jet misidentified as a photon. We find that the $p_T^γ$ distributions of the backgrounds decrease faster than that of the signal with increasing of the transverse momentum of the photon. The $η^γ$ distributions of the backgrounds are almost flat in the full range of $η^γ$. In contrast, the signal lies mainly in the central region of $η^γ$. These characteristics may help to select the events in experiments. We show that in the parameter space allowed by the relic abundance constraint, which we have calculated at the NLO QCD level, the LHC with $\sqrt{S}=7{\rm TeV}$ may discovery this signal at the $5σ$ level after collecting an integrated luminosity of $1 {\rm fb}^{-1}$. On the other hand, if this signal is not observed at the LHC, we can set a lower limit on the new physics scale at the $3σ$ level.

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