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arXiv 1602.08103hep-phastro-ph.COhep-ex
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超对称暗物质遗迹密度的理论不确定性

Theoretical uncertainty of the supersymmetric dark matter relic density from scheme and scale variations

J. Harz, B. Herrmann, M. Klasen, K. Kovarik, P. Steppeler

摘要:

对于粒子物理观测在对撞机,如大型强子对撞机在欧洲核子研究中心,它一直是常见的做法,几十年来估计理论的不确定性,通过研究预测的截面的变化与先验不可预测的尺度。在天体粒子物理学中,这到目前为止还不可能,因为大多数的观测量都是在玻恩能级上计算的,所以重整化方案和尺度依赖性不能以有意义的方式进行研究。在本文中,我们提出的第一个定量研究的理论不确定性的中性伴暗物质遗迹密度从方案和规模的变化。我们首先详细解释了重整化尺度如何通过耦合常数,质量和混合角进入树级计算。然后,我们证明了一个单一的循环SUSY-QCD修正在许多不同的暗物质湮灭通道的重整化尺度依赖性的减少和增强的微扰稳定性的混合上壳层/$\bar{\rm DR}$重整化计划在一个纯$\bar{\rm DR}$计划在顶夸克部门。在停止-停止湮灭通道中,索末菲增强及其尺度依赖性被证明是特别重要的。最后,在三种典型的十一参数唯象最小超对称标准模型(pMSSM-11)中,研究了我们的高阶超对称QCD修正及其标度不确定性的影响.我们发现,在许多情况下,理论的不确定性降低,并可以成为在某些情况下的实验之一的大小相媲美。

英文摘要:

For particle physics observables at colliders such as the LHC at CERN, it has been common practice for many decades to estimate the theoretical uncertainty by studying the variations of the predicted cross sections with a priori unpredictable scales. In astroparticle physics, this has so far not been possible, since most of the observables were calculated at Born level only, so that the renormalization scheme and scale dependence could not be studied in a meaningful way. In this paper, we present the first quantitative study of the theoretical uncertainty of the neutralino dark matter relic density from scheme and scale variations. We first explain in detail how the renormalization scale enters the tree-level calculations through coupling constants, masses and mixing angles. We then demonstrate a reduction of the renormalization scale dependence through one-loop SUSY-QCD corrections in many different dark matter annihilation channels and enhanced perturbative stability of a mixed on-shell/$\bar{\rm DR}$ renormalization scheme over a pure $\bar{\rm DR}$ scheme in the top-quark sector. In the stop-stop annihilation channel, the Sommerfeld enhancement and its scale dependence are shown to be of particular importance. Finally, the impact of our higher-order SUSY-QCD corrections and their scale uncertainties are studied in three typical scenarios of the phenomenological Minimal Supersymmetric Standard Model with eleven parameters (pMSSM-11). We find that the theoretical uncertainty is reduced in many cases and can become comparable to the size of the experimental one in some scenarios.

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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