arXiv 0707.06182007-07-04hep-ph

压缩超对称性对对撞机和暗物质的影响

Implications of Compressed Supersymmetry for Collider and Dark Matter Searches

Howard Baer, Andrew Box, Eun-Kyung Park, Xerxes Tata

备注：: 22 pages including 24 eps figures
发表信息：: JHEP 0708:060,2007
DOI：: 10.1088/1126-6708/2007/08/060

摘要：

马丁提出了一个被称为"压缩超对称“（SUSY）的方案，其中MSSM是能量标度M_{\rm weak}和M_{\rm GUT}之间的有效场论，但具有大统一理论（GUT）标度SU（3），高根质量M_3<< M_1或M_2。结果，夸克和胶子的质量相对于slepton，chargino和neutralino的质量被抑制，导致压缩的sparticle质谱，早期宇宙中的暗物质遗迹密度可能主要是由neutralino湮灭到ttbar对通过交换轻顶夸克。我们探索的暗物质和对撞机信号预计从压缩超对称性两个不同的模型线与不同的假设大统一理论尺度的高吉诺质量参数。对于暗物质信号，压缩的squark频谱导致直接检测率的增强与统一的高吉诺质量的模型相比。与此同时，相对于统一的高吉诺质量的相关场景，中性伴子晕对伽马射线和反物质的湮灭率也有所提高，但取决于晕暗物质的分布，可能还低于正在进行的间接搜索的灵敏度。在对撞机信号的情况下，我们比较了可能在大型强子对撞机级联衰变链中产生的stop_1的潜在主导衰变模式的速率：\tst_1 \to c \tz_1和\tst_1 \to bW \tz_1。我们研究的程度，多轻子信号率降低时，两体衰变模式占主导地位。对于我们在这里检查的模型线，多轻子信号，虽然减少了，仍然可以在LHC中观察到。

英文摘要：

Martin has proposed a scenario dubbed ``compressed supersymmetry'' (SUSY) where the MSSM is the effective field theory between energy scales M_{\rm weak} and M_{\rm GUT}, but with the GUT scale SU(3) gaugino mass M_3<< M_1 or M_2. As a result, squark and gluino masses are suppressed relative to slepton, chargino and neutralino masses, leading to a compressed sparticle mass spectrum, and where the dark matter relic density in the early universe may be dominantly governed by neutralino annihilation into ttbar pairs via exchange of a light top squark. We explore the dark matter and collider signals expected from compressed SUSY for two distinct model lines with differing assumptions about GUT scale gaugino mass parameters. For dark matter signals, the compressed squark spectrum leads to an enhancement in direct detection rates compared to models with unified gaugino masses. Meanwhile, neutralino halo annihilation rates to gamma rays and anti-matter are also enhanced relative to related scenarios with unified gaugino masses but, depending on the halo dark matter distribution, may yet be below the sensitivity of indirect searches underway. In the case of collider signals, we compare the rates for the potentially dominant decay modes of the stop_1 which may be expected to be produced in cascade decay chains at the LHC: \tst_1\to c\tz_1 and \tst_1\to bW\tz_1. We examine the extent to which multilepton signal rates are reduced when the two-body decay mode dominates. For the model lines that we examine here, the multi-lepton signals, though reduced, still remain observable at the LHC.

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