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arXiv 1208.5533hep-phastro-ph.CO
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根据轻元素丰度允许slepton代际混合

Allowed slepton intergenerational mixing in light of light element abundances

Kazunori Kohri, Shingo Ohta, Joe Sato, Takashi Shimomura, Masato Yamanaka

摘要:

本文从大爆炸核合成的观点出发,研究了slepton-neutralino共湮灭情形下slepton代际混合参数的允许区域。在这种情况下,$^7$ Li和$^6$ Li问题可以通过考虑由长寿命slepton的束缚态效应引起的奇异反应来解决。轻元素丰度的计算作为函数的遗物密度和寿命的slepton,这在很大程度上取决于代际混合参数。与观测的轻元素丰度相比,我们得到了代际混合的允许区域。在解决$^7$ Li和$^6$ Li问题的$2\times 10^{-11} \lesssim c_e \lesssim 2\times 10^{-9}$中,允许selectron分量与stau分量之比$c_e$。同样地,对于斯介子,$c_μ$的比率在$%2\times 10^{-7} \lesssim c_μ \lesssim 5\times 10^{-5}$中允许用于slepton和中性伴子之间的质量差,其小于μ子质量,而$ %10^{-11}\lesssim c_μ \lesssim 2\times 10^{-10}$用于μ子质量和125 MeV之间的质量差。我们还讨论了斯莱普顿衰变的对撞机特征。在允许的混合参数下,我们发现了斯莱普顿衰变事例数动量分布的特征双峰。在未来的对撞机实验中发现的双峰应该证实了我们的设想。

英文摘要:

We studied allowed region on the intergenerational mixing parameters of sleptons from a viewpoint of big-bang nucleosynthesis in a slepton-neutralino coannihilation scenario. In this scenario, $^7$Li and $^6$Li problems can be solved by considering exotic reactions caused by bound-state effects with a long-lived slepton. Light element abundances are calculated as functions of the relic density and lifetime of the slepton which considerably depend on the intergenerational mixing parameters. Compared with observational light element abundances, we obtain allowed regions on the intergenerational mixing. Ratio of selectron component to stau component, $c_e$, is allowed in $2\times 10^{-11} \lesssim c_e \lesssim 2\times 10^{-9}$ with solving both the $^7$Li and $^6$Li problems. Similarly, the ratio for smuon, $c_μ$, is allowed in $%2\times 10^{-7} \lesssim c_μ \lesssim 5\times 10^{-5}$ for mass difference between slepton and neutralino, which is smaller than muon mass, and $ %10^{-11}\lesssim c_μ \lesssim 2\times 10^{-10}$ for the mass difference in range between muon mass and 125 MeV. We also discuss collider signatures of the slepton decays. We find characteristic double peaks in momentum distribution of event number of the slepton decays with allowed mixing parameters. Discoveries of the double peaks at future collider experiments should confirm our scenario.

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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