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arXiv 0705.0921hep-ph
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mSUGRA模型中的非零三线性参数-Tevatron和LHC的暗物质和对撞机信号

Non-zero trilinear parameter in the mSUGRA model - dark matter and collider signals at Tevatron and LHC

Utpal Chattopadhyay, Debottam Das, Amitava Datta, Sujoy Poddar

备注：
Some minor changes made in the text. To appear in Phys Rev D
发表信息：
Phys.Rev.D76:055008,2007
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摘要：

在具有小$m_0$和小$m_{1/2}$的最小超引力（mSUGRA）模型中，参数空间的现象学上可行和有趣的区域与WMAP关于暗物质遗迹密度的数据和LEP 2中最轻的希格斯标量$ m_h>$ 114 GeV的质量上的束缚一致，如果相当特别的假设$A_0$ =0，则打开，其中$A_0$是常见的三线性软破裂参数，在大多数现有的分析中使用的是放松的。由于该区域对应于相对较轻的方子和胶子，它们可能在LHC实验的早期阶段被广泛探测，因此详细研究了$A_0$的中等或大负值的后果。我们发现，在该区域，最轻超对称粒子对湮灭、超对称粒子对与较轻的τ-slepton（${\tilde τ}_1$）共湮灭和超对称粒子对与较轻的顶夸克（${\tilde t}_1$）共湮灭等过程对观测到的暗物质遗迹密度都有贡献. % \sout{The possibility that a relic density producing ${\tilde t}_1$ can be %observed at the current experiments at the Tevatron is wide open.}一个${\tilde t}_1$，可以参与共湮灭与最轻的中性伴子，以满足WMAP约束的遗迹密度，同时被观察到在目前的实验在Tevatron的可能性是很大的开放。在大型强子对撞机上，大量的夸克-胶子事件导致了一个非常独特的半包容性签名$τ^\pm$ +X $_τ$（任何没有τ轻子的东西），其特征尺寸远大于$e^\pm$ +X $_e$或$μ^\pm$ +X $_μ$事件。

英文摘要：

Phenomenologically viable and interesting regions of parameter space in the minimal super-gravity (mSUGRA) model with small $m_0$ and small $m_{1/2}$ consistent with the WMAP data on dark matter relic density and the bound on the mass of the lightest Higgs scalar $ m_h>$ 114 GeV from LEP2 open up if the rather adhoc assumption $A_0$=0, where $A_0$ is the common trilinear soft breaking parameter, employed in most of the existing analyses is relaxed. Since this region corresponds to relatively light squarks and gluinos which are likely to be probed extensively in the very early stages of the LHC experiments, the consequences of moderate or large negative values of $A_0$ are examined in detail. We find that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP - lighter tau slepton (${\tilde τ}_1$) coannihilation and LSP - lighter top squark (${\tilde t}_1$) coannihilation contribute to the observed dark matter relic density. %\sout{The possibility that a relic density producing ${\tilde t}_1$ can be %observed at the current experiments at the Tevatron is wide open.} The possibility that a ${\tilde t}_1$ that can participate in coannihilation with the lightest neutralino to satisfy the WMAP bound on relic density and at the same time be observed at the current experiments at the Tevatron is wide open. At the LHC a large number of squark - gluino events lead to a very distinctive semi-inclusive signature $τ^\pm$+X$_τ$ (anything without a tau lepton) with a characteristic size much larger than $e^\pm$+X$_e$ or $μ^\pm$+X$_μ$ events.

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