Discovery potential for supersymmetry in CMS
Discovery potential for supersymmetry in CMS
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DOI：
10.1088/0954-3899/28/3/401
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发表时间：
1998-06
期刊：
影响因子：
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通讯作者：
A. Sirunyan;A. Tumasyan;W. Adam;F. Ambrogi;E. Asilar;T. Bergauer;J. Brandstetter;M. Dragicevic-
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文献类型：
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作者：
A. Sirunyan;A. Tumasyan;W. Adam;F. Ambrogi;E. Asilar;T. Bergauer;J. Brandstetter;M. Dragicevic-
本文对紧凑型介子螺线管(CMS)中有关夸克和胶子、斯普顿、查尔吉诺和中性微子、超对称暗物质、最轻希格斯粒子、超粒子质量测定方法和探测器设计优化的研究进行了全面的总结和展望。它代表了截至1997年夏天我们对这些问题的理解情况。作为基准，我们使用了最小超重力激发的超对称标准模型(MSUGRA)，其中包含一个稳定的最轻超对称粒子(LSP)。在大型强子对撞机上发现超对称性应该是相对简单的。它可能是通过观察到丢失的外星人加喷流中大量的事件，或者是一个或多个孤立的轻子而发生的。过量的三轻子事件或缺失ET的孤立双轻子，在L+L的−不变质量分布中表现出特征特征，也可能是超对称产生的第一个表现。当质量超过2TeV时，可以发现夸克和胶子。在双轻子或三轻子末态的大量事件中，可以发现查尔吉诺和中性星。包含性搜索可以从它们在夸克和胶子级联衰变中的大量产生给出早期迹象。有关睡眠的间接证据也可以从包容性双轻子研究中获得。隔离要求和喷气式否决权将允许检测直接充电/中立化生产和直接生产的斯普顿。夸克和胶子的产生也可能是希格斯玻色子通过级联衰变的丰富来源。最轻的超对称希格斯H→b可以用1阶的信号/背景比重建，这要归功于通过转义LSP而对ETMISS进行的硬切割。具有守恒R宇称的超对称模型的LSP是研究宇宙暗物质的一个很好的候选者。我们的搜索很好地覆盖了参数空间中这一点成立的区域，至少在tanβ=2的情况下是这样。如果电弱标度存在超对称性，它很难逃脱CMS的检测，超对称性的研究将成为我们物理计划的中心部分。
This work summarizes and puts in an overall perspective studies done within the compact muon solenoid (CMS) concerning the discovery potential for squarks and gluinos, sleptons, charginos and neutralinos, supersymmetric (SUSY) dark matter, lightest Higgs, sparticle mass determination methods and the detector design optimization in view of SUSY searches. It represents the status of our understanding of these subjects as of summer 1997. As a benchmark we used the minimal supergravity-inspired supersymmetric standard model (mSUGRA) with a stable lightest supersymmetric particle (LSP). Discovery of supersymmetry at the large hadron collider should be relatively straightforward. It may occur through the observation of large excesses of events in missing ET plus jets, or with one or more isolated leptons. An excess of trilepton events or isolated dileptons with missing ET, exhibiting a characteristic signature in the l+l− invariant mass distribution, could also be the first manifestation of SUSY production. Squarks and gluinos can be discovered for masses in excess of 2 TeV. Charginos and neutralinos can be discovered from an excess of events in dilepton or trilepton final states. Inclusive searches can give early indications from their copious production in squark and gluino cascade decays. Indirect evidence for sleptons can also be obtained from inclusive dilepton studies. Isolation requirements and a jet veto would allow detection of both the direct chargino/neutralino production and the directly produced sleptons. Squark and gluino production may also represent a copious source of Higgs bosons through cascade decays. The lightest SUSY Higgs h → b may be reconstructed with a signal/background ratio of order 1 thanks to hard cuts on ETmiss justified by escaping LSPs. The LSP of SUSY models with conserved R-parity represents a very good candidate for cosmological dark matter. The region of parameter space where this is true is well covered by our searches, at least for tanβ = 2. If supersymmetry exists at the electroweak scale, it could hardly escape detection in CMS and the study of supersymmetry will form a central part of our physics program.