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arXiv 1208.5166hep-phastro-ph.CO
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偶然超对称暗物质与重子生成

Accidental Supersymmetric Dark Matter and Baryogenesis

Jonathan Kozaczuk, Stefano Profumo, Carroll L. Wainwright

摘要:

我们表明,“偶然”超对称性是一个超越标准模型的框架,自然容纳热遗迹暗物质候选人和成功的电弱重子生成,包括所需的强烈的电弱相变的一阶字符。我们从暗物质和重子生成的观点来研究这种现象。对于电弱相变温度附近的能量,低能有效理论类似于MSSM,其中包含第三代夸克、希格斯玻色子和规范玻色子的轻超伙伴。我们计算了暗物质残余丰度和重子不对称性在偶然超对称性参数空间中的分布,包括共振和非共振CP破坏源。我们发现,有参数空间的区域产生的重子不对称性的观测值和暗物质候选人与正确的遗迹密度和符合当今的限制从暗物质搜索。这一方案对粒子谱做出了精确的预测,预测最轻的中性伴子质量在200到500 GeV之间,所有电荷伴子和中性伴子的质量都在最轻的中性伴子质量的2倍以内,而重的希格斯部分在质量的20-25%以内,使其成为对撞机搜索的有趣目标。此外,我们证明,成功的意外超对称暗物质和重子生成将最终测试改进小于一个数量级的电子电偶极矩搜索和直接暗物质搜索,以及与冰立方加深核中微子望远镜数据的当前性能。

英文摘要:

We show that "accidental" supersymmetry is a beyond-the-Standard Model framework that naturally accommodates a thermal relic dark matter candidate and successful electroweak baryogenesis, including the needed strongly first-order character of the electroweak phase transition. We study the phenomenology of this setup from the standpoint of both dark matter and baryogenesis. For energies around the electroweak phase transition temperature, the low-energy effective theory is similar to the MSSM with light super-partners of the third-generation quarks and of the Higgs and gauge bosons. We calculate the dark matter relic abundance and the baryon asymmetry across the accidental supersymmetry parameter space, including resonant and non-resonant CP-violating sources. We find that there are regions of parameter space producing both the observed value of the baryon asymmetry and a dark matter candidate with the correct relic density and conforming to present-day constraints from dark matter searches. This scenario makes sharp predictions for the particle spectrum, predicting a lightest neutralino mass between 200 and 500 GeV, with all charginos and neutralinos within less than a factor 2 of the lightest neutralino mass and the heavy Higgs sector within 20-25% of that mass, making it an interesting target for collider searches. In addition, we demonstrate that successful accidental supersymmetric dark matter and baryogenesis will be conclusively tested with improvements smaller than one order of magnitude to the current performance of electron electric dipole moment searches and of direct dark matter searches, as well as with IceCube plus Deep Core neutrino telescope data.

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