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arXiv 0907.1922hep-ph
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LHC在$\sqrt{s}=$ 10和14 TeV处的超对称发现潜力，没有和有缺失的$E_T$

Supersymmetry discovery potential of the LHC at $\sqrt{s}=$10 and 14 TeV without and with missing $E_T$

H. Baer, V. Barger, A. Lessa, X. Tata

备注：
34 pages, 25 figures. Revised projections for the SUSY reach for ab^-1 integrated luminosities, with minor corrections of references and text. 2 figures added. To appear in JHEP
发表信息：
JHEP 0909:063,2009
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摘要：

我们研究的超对称性（SUSY）达到欧洲核子研究中心的大型强子对撞机运行在$\sqrt{s}=10$和14 TeV的最小超引力模型的框架内。我们改进了以前的达到预测，将更新的背景计算，包括各种$2\to n$标准模型（SM）的过程。我们表明，超对称发现是可能的，甚至在探测器被理解得足够好，利用$E_T^{\rm miss}$或电子的信号。我们评估的早期超对称性达到的大型强子对撞机在$\sqrt{s}=10$ TeV的检查多μ子加上$\ge4$射流，也dijet事件与{ \it没有}失踪$E_T$削减，并表明，最大的达到$m_{1/2}$发生在dijet通道。在$m_{1/2}$中，多μ子的范围稍小，但扩展到更高的$m_0$值。我们发现，一个可观察到的多μ子信号将首先出现在相反的符号dimuon通道，但随着积分光度增加的相对无背景，但速率有限的同符号dimuon，并最终三μ子通道产生最高的到达。我们在这些通道中显示了特征分布，这些通道用于区分SM背景信号，也有助于证实其超对称性起源。然后，我们评估的LHC达到各种无轻子和多轻子加喷流通道{ \it包括}失踪$E_T$削减为$\sqrt{s}=10$和14 TeV，并绘制范围高达3000 fb $^{-1}$在SLHC的综合光度。对于$\sqrt{s}=10$ TeV，LHC的范围扩展到$m_{gluino}=1.9, 2.3, 2.8$和2.9 TeV的$m_{squark}\sim m_{gluino}$和10，100，1000和3000 fb $^{-1}$的积分光度分别。对于$\sqrt{s}=14$ TeV，LHC达到相同的积分光度是$m_{gluino}=2.4,\3.1, 3.7$和4.0 TeV。

英文摘要：

We examine the supersymmetry (SUSY) reach of the CERN LHC operating at $\sqrt{s}=10$ and 14 TeV within the framework of the minimal supergravity model. We improve upon previous reach projections by incorporating updated background calculations including a variety of $2\to n$ Standard Model (SM) processes. We show that SUSY discovery is possible even before the detectors are understood well enough to utilize either $E_T^{\rm miss}$ or electrons in the signal. We evaluate the early SUSY reach of the LHC at $\sqrt{s}=10$ TeV by examining multi-muon plus $\ge4$ jets and also dijet events with {\it no} missing $E_T$ cuts and show that the greatest reach in terms of $m_{1/2}$ occurs in the dijet channel. The reach in multi-muons is slightly smaller in $m_{1/2}$, but extends to higher values of $m_0$. We find that an observable multi-muon signal will first appear in the opposite-sign dimuon channel, but as the integrated luminosity increases the relatively background-free but rate-limited same-sign dimuon, and ultimately the trimuon channel yield the highest reach. We show characteristic distributions in these channels that serve to distinguish the signal from the SM background, and also help to corroborate its SUSY origin. We then evaluate the LHC reach in various no-lepton and multi-lepton plus jets channels {\it including} missing $E_T$ cuts for $\sqrt{s}=10$ and 14 TeV, and plot the reach for integrated luminosities ranging up to 3000 fb$^{-1}$ at the SLHC. For $\sqrt{s}=10$ TeV, the LHC reach extends to $m_{gluino}=1.9, 2.3, 2.8$ and 2.9 TeV for $m_{squark}\sim m_{gluino}$ and integrated luminosities of 10, 100, 1000 and 3000 fb$^{-1}$, respectively. For $\sqrt{s}=14$ TeV, the LHC reach for the same integrated luminosities is to $m_{gluino}=2.4,\3.1, 3.7$ and 4.0 TeV.

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