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arXiv 0806.1184hep-ph
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用马尔可夫链蒙特卡罗方法研究大容量字符串方案对WMAP5和其它间接约束的全局拟合

Global Fits of the Large Volume String Scenario to WMAP5 and Other Indirect Constraints Using Markov Chain Monte Carlo

B. C. Allanach, M. J. Dolan, A. M. Weber

摘要:

我们提出了全球适合大容量的情况下(LVS)的字符串模型使用当前的间接数据。我们使用WMAP 5约束暗物质遗迹密度,b-物理和电弱观测以及直接搜索约束。这样的数据可以通过LVS进行充分拟合,对于8个自由度,mu>0的最佳拟合点具有chi ^2 =13.6。由此产生的参数空间上的约束是鲁棒的,因为它们不太依赖于先验,或者取决于是否使用贝叶斯或频率论的数据解释。超对称粒子的质量被限制在远低于1 TeV的水平,这预示着LHC早期的超对称发现。我们设计了一种方法来量化哪些是最重要的约束。我们发现LEP 2 Higgs质量约束、暗物质的残余密度和μ子的反常磁矩对拟合的影响最大。

英文摘要:

We present global fits to the Large Volume Scenario (LVS) of string models using current indirect data. We use WMAP5 constraints on dark matter relic density, b-physics and electroweak observables as well as direct search constraints. Such data can be adequately fit by LVS, with the best-fit point for mu>0 having chi^2=13.6 for 8 degrees of freedom. The resulting constraints on parameter space are robust in that they do not depend much upon the prior, or upon whether one uses Bayesian or frequentist interpretations of the data. Sparticle masses are constrained to be well below the 1 TeV level, predicting early SUSY discovery at the LHC. We devise a method of quantifying which are the most important constraints. We find that the LEP2 Higgs mass constraint, the relic density of dark matter and the anomalous magnetic moment of the muon affect the fits to the strongest degree.

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