Dark matter and collider phenomenology of split-UED
Dark matter and collider phenomenology of split-UED
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DOI：
10.1088/1126-6708/2009/09/078
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发表时间：
2009-03
影响因子：
5.4
通讯作者：
C. Chen;M. Nojiri;S. Park;J. Shu;M. Takeuchi
中科院分区：
文献类型：
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作者：
C. Chen;M. Nojiri;S. Park;J. Shu;M. Takeuchi
我们明确表明，分裂通用额外维度（split-UED）是最近提出的通用额外维度（UED）模型的扩展，可以很好地解释最近 PAMELA 和 ATIC/PPB-BETS 观测到的宇宙射线正电子和电子异常。卡鲁扎-克莱因 (KK) 暗物质主要湮灭成轻子，因为强子分支分数被大 KK 夸克质量高度抑制，并且反质子通量与观察结果非常吻合，没有发现多余的物质。介子衰变产生的宇宙伽马射线通量也受到高度抑制，在低能区（E?20 GeV）几乎无法检测到。详细研究了大型强子对撞机中彩色 KK 粒子的对撞机特征，特别是 q1q1 的产生。由于KK夸克和其他粒子的质量分裂较大，会产生硬pT喷流和缺失的ET，这使得抑制标准模型背景并发现信号成为可能。
We explicitly show that split-universal extra dimension (split-UED), a recently suggested extension of universal extra dimension (UED) model, can nicely explain recent anomalies in cosmic-ray positrons and electrons observed by PAMELA and ATIC/PPB-BETS. Kaluza-Klein (KK) dark matters mainly annihilate into leptons because the hadronic branching fraction is highly suppressed by large KK quark masses and the antiproton flux agrees very well with the observation where no excess is found. The flux of cosmic gamma-rays from pion decay is also highly suppressed and hardly detected in low energy region (E?20 GeV). Collider signatures of colored KK particles at the LHC, especially q1q1 production, are studied in detail. Due to the large split in masses of KK quarks and other particles, hard pT jets and missing ET are generated, which make it possible to suppress the standard model background and discover the signals.