Scrutinizing the lightest supersymmetric particle dark matter at the CERN LHC
Scrutinizing the lightest supersymmetric particle dark matter at the CERN LHC
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在 CERN LHC 仔细研究最轻的超对称粒子暗物质
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Tomio Kobayashi
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文献类型：
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作者：
M. Drees;Yeong Gyun Kim;M. Nojiri;D. Toya;K. Hasuko;Tomio Kobayashi
我们表明，CERN LHC 实验很可能能够确定预测大爆炸时代热 LSP 遗迹当前密度所需的所有参数。如果 LSP 几乎是纯 $Bensuremath{-}mathrm{i}mathrm{n}mathrm{o}$，我们通常只需要确定它的质量和 $mathrm{SU}(2)$ 单线态轻子的质量。该信息可以通过重建级联 ${q}_{L}ensuremath{ 来获得
ightarrow}{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{0}stackrel{ensuremath{
ightarrow}}{q}{l}_{R}lstackrel{ensuremath{
ightarrow}}{q}{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{1}^{0}{l}^{+}{l}^{ensuremath{-}}q.$ 唯一的要求是 ${m}_{{l}_{R}}l{m}_{{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{0}},$ 对于大多数宇宙学上有趣的参数空间来说都是如此。如果 LSP 具有显着的 Higgsino 成分，则其预测的热遗迹密度小于等质量的 $Bensuremath{-}mathrm{i}mathrm{n}mathrm{o}。$ 我们表明，在这种情况下，夸克衰变也会产生大量的 ${stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{4}^{0}$ 和${stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{ifmmodepmelse extpmfi{}}.$ 重建相应的衰减级联可以让我们确定 LSP 的 Higgsino 分量。
We show that CERN LHC experiments might well be able to determine all the parameters required for a prediction of the present density of thermal LSP relics from the big bang era. If the LSP is an almost pure $Bensuremath{-}mathrm{i}mathrm{n}mathrm{o}$ we usually only need to determine its mass and the mass of the $mathrm{SU}(2)$ singlet sleptons. This information can be obtained by reconstructing the cascade ${q}_{L}ensuremath{
ightarrow}{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{0}stackrel{ensuremath{
ightarrow}}{q}{l}_{R}lstackrel{ensuremath{
ightarrow}}{q}{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{1}^{0}{l}^{+}{l}^{ensuremath{-}}q.$ The only requirement is that ${m}_{{l}_{R}}l{m}_{{stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{0}},$ which is true for most of the cosmologically interesting parameter space. If the LSP has a significant Higgsino component, its predicted thermal relic density is smaller than for an equal-mass $Bensuremath{-}mathrm{i}mathrm{n}mathrm{o}.$ We show that in this case squark decays also produce significant numbers of ${stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{4}^{0}$ and ${stackrel{ifmmode ilde{}else ~{}fi{}}{ensuremath{chi}}}_{2}^{ifmmodepmelse extpmfi{}}.$ Reconstructing the corresponding decay cascades then allows us to determine the Higgsino component of the LSP.