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arXiv 1002.2430hep-ph
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在LHC上暗物质作为轻胶子的向导

Dark Matter as a Guide Toward a Light Gluino at the LHC

Daniel Feldman, Gordon Kane, Ran Lu, Brent D. Nelson

摘要:

基于与暗物质特征的特定联系,我们研究了观测到质量在~(500-900)GeV范围内的相对较轻的胶子和质量在~(170-210)GeV范围内的最轻的类葡萄酒超对称粒子的前景。这里研究的轻的高更诺光谱通常不同于其他模型,特别是那些具有维诺主导LSP的模型,因为这里的胶子可以显着更轻。PAMELA卫星数据报告的正电子过剩是由维诺LSP的湮灭引起的,由于模场的晚期衰变重新填充了遗迹暗物质的密度,它们的遗迹丰度通常可以接近WMAP的约束。我们还提到最近费米光子的约束湮灭暗物质在这类模型和直接检测实验,包括CDMS和氙的影响。我们研究这些签名的超对称模型与非最小的软破缺条款来自弦紧化和相关的超引力模型,通常会导致非普遍的高根质量。在大型强子对撞机,从三体衰变的胶子在某些部分的参数空间的大事件率被发现,引起早期发现的前景,高吉诺部门。在质心能量为10 TeV时,5 sigma能级的过剩事件可以在低至100 pb^{-1}量级的亮度下出现,在质心能量为7 TeV时,其亮度小于~ 1 fb^{-1}。

英文摘要:

Motivated by specific connections to dark matter signatures, we study the prospects of observing the presence of a relatively light gluino whose mass is in the range ~(500-900) GeV with a wino-like lightest supersymmetric particle with mass in the range of ~(170-210) GeV. The light gaugino spectra studied here is generally different from other models, and in particular those with a wino dominated LSP, in that here the gluinos can be significantly lighter. The positron excess reported by the PAMELA satellite data is accounted for by annihilations of the wino LSP and their relic abundance can generally be brought near the WMAP constraints due to the late decay of a modulus field re-populating the density of relic dark matter. We also mention the recent FERMI photon constraints on annihilating dark matter in this class of models and implications for direct detection experiments including CDMS and XENON. We study these signatures in models of supersymmetry with non-minimal soft breaking terms derived from both string compactifications and related supergravity models which generally lead to non-universal gaugino masses. At the LHC, large event rates from the three-body decays of the gluino in certain parts of the parameter space are found to give rise to early discovery prospects for the gaugino sector. Excess events at the 5 sigma level can arise with luminosity as low as order 100 pb^{-1} at a center of mass energy of 10 TeV and less than ~ 1 fb^{-1} at a center of mass energy of 7 TeV.

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