轻中性伴子作为暗物质是否仍然可行？
Is light neutralino as dark matter still viable?
摘要：
受CoGENT最近对去年观测到的低能过剩事件的重新确认，以及最近XENON-100实验与CoGENT数据存在争议的改进限制的启发，我们重新研究了最小超对称标准模型和次最小超对称标准模型的低质量中性伴子区域，两者都没有假设高真质量统一。我们对每个模型进行几次集中扫描，确定输入参数的保守约束。然后，我们确定如何使这些约束越来越严格，因为我们重新调用我们的实验约束，涉及的暗物质遗迹丰度，对撞机的限制LEP和Tevatron，然后从味物理，作为一系列连续的2西格玛硬削减。我们发现，对于这两个模型，当所有相关的约束都以这种方式应用时，我们不会产生具有超过10^-5 pb的自旋无关散射截面和质量~7 GeV < m_chi < ~9 GeV的中性伴子LSP，这对于解释CoGENT观测是必要的。
英文摘要：
Motivated by the recent re-confirmation by CoGENT of the low-energy excess of events observed last year, and the recent improved limits from the XENON-100 experiment that are in contention with the CoGENT data, we re-examine the low mass neutralino region of the Minimal Supersymmetric Standard Model and of the Next-to-Minimal Supersymmetric Standard Model, both without assuming gaugino mass unification. We make several focused scans for each model, determining conservative constraints on input parameters. We then determine how these constraints are made increasingly stringent as we re-invoke our experimental constraints involving the dark matter relic abundance, collider constraints from LEP and the Tevatron, and then from flavour physics, as a series of successive 2 sigma hard cuts. We find that for both models, when all relevant constraints are applied in this fashion, we do not generate neutralino LSPs that possess a spin-independent scattering cross section in excess of 10^-5 pb and a mass ~7 GeV < m_chi < ~9 GeV that is necessary in order to explain the CoGENT observations.
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