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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1004.3594hep-ph
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LHC发现具有\sqrt{s} =7 TeV和1 fb^{-1}的超对称性的能力

Capability of LHC to discover supersymmetry with \sqrt{s}=7 TeV and 1 fb^{-1}

Howard Baer, Vernon Barger, Andre Lessa, Xerxes Tata

摘要:

我们研究了欧洲核子研究中心大型强子对撞机发现能量为\sqrt{s} =7 TeV、积分亮度约为1 fb^{-1}的超对称性的能力。我们的结果是在范式最小超引力模型(mSUGRA或CMSSM)。使用一个6维网格的削减优化的信号背景-包括丢失的E_T-我们发现m_{\tg} \sim m_{\tq}的LHC达到m_{\tg} \sim 800,1950,1100和1200 GeV的0.1,0.3,1和2 fb^{-1},分别。对于m_{\tg} << m_{\tq},对于相同的积分亮度,可达范围反而接近m_{\tg} \sim 480、1540、1620和700 GeV。我们还研究了LHC在非常低的积分亮度的情况下的范围,其中丢失的E_T可能是不可行的。我们重点研究了多μ子、多轻子(包括电子)和双喷流信号。虽然在这些情况下,没有E_T^{miss}的LHC达到的范围要小得多,但它仍然是相当大的:对于0.3 fb^{-1},在很低的m_0下,用胶子质量表示的双喷流达到600 GeV,而在m_0值的范围内,双轻子达到\sim 500 GeV的胶子质量。

英文摘要:

We examine the capability of the CERN Large Hadron Collider to discovery supersymmetry (SUSY) with energy \sqrt{s}=7 TeV and integrated luminosity of about 1 fb^{-1}. Our results are presented within the paradigm minimal supergravity model (mSUGRA or CMSSM). Using a 6-dimensional grid of cuts for optimization of signal to background-- including missing E_T-- we find for m_{\tg}\sim m_{\tq} an LHC reach of m_{\tg}\sim 800,\ 950,\ 1100 and 1200 GeV for 0.1, 0.3, 1 and 2 fb^{-1}, respectively. For m_{\tg}<< m_{\tq}, the reach is instead near m_{\tg}\sim 480,\ 540,\ 620 and 700 GeV, for the same integrated luminosities. We also examine the LHC reach in the case of very low integrated luminosity where missing E_T may not be viable. We focus on the multi-muon, multi-lepton (including electrons) and dijet signals. Although the LHC reach without E_T^{miss} is considerably lower in these cases, it is still substantial: for 0.3 fb^{-1}, the dijet reach in terms of gluino mass is up to 600 GeV for very low m_0, while the dilepton reach is to gluino masses of \sim 500 GeV over a range of m_0 values.

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