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arXiv 0909.3408hep-phastro-ph.CO
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III型跷跷板中的最小暗物质

Minimal dark matter in type III seesaw

Eung Jin Chun

摘要:

我们探讨了一个新的暗物质候选人在超对称III型跷跷板机制的Y=0三重态的中性标量分量可以是最轻的超对称粒子的可能性。它的热丰度可以在正确的范围内,如果非标准的宇宙学,如kination支配假设。暗物质湮灭到W+W-的增强截面可以留下可检测的天体物理学和宇宙学信号,其当前的观测数据对暗物质质量提出了下限。该模型预言存在一个几乎与暗物质标量简并的带电标量,其寿命在5.5 cm ~ 6.3 m之间。在大型强子对撞机实验中,通过对慢运动高电离径迹的识别,为暗物质质量测量提供了新的机会。如果最轻的超对称粒子是通常的比诺,它的衰变会导致与可观察的位移顶点相关的同号双轻子和双荷标量的清晰特征,这些特征基本上是无背景的,并且可以完全重建。

英文摘要:

We explore the possibility of a new dark matter candidate in the supersymmetric type III seesaw mechanism where a neutral scalar component of the Y=0 triplet can be the lightest supersymmetric particle. Its thermal abundance can be in the right range if non-standard cosmology such as kination domination is assumed. The enhanced cross-section of the dark matter annihilation to W+W- can leave detectable astrophysical and cosmological signals whose current observational data puts a lower bound on the dark matter mass. The model predicts the existence of a charged scalar almost degenerate with the dark matter scalar and its lifetime lies between 5.5 cm and 6.3 m. It provides a novel opportunity of the dark mater mass measurement by identifying slowly-moving and highly-ionizing tracks in the LHC experiments. If the ordinary lightest supersymmetric particle is the usual Bino, its decay leads to clean signatures of same-sign di-lepton and di-charged-scalar associated with observable displaced vertices which are essentially background-free and can be fully reconstructed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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