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arXiv 0705.2012hep-phastro-ph
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b到s γ的新预测对约束MSSM的影响

Implications for the Constrained MSSM from a new prediction for b to s gamma

Leszek Roszkowski, Roberto Ruiz de Austri, Roberto Trotta

摘要:

我们重新检查的约束MSSM的属性,根据更新的约束,特别注意最近的重大转变的影响,在标准模型预测BR(B到X_s伽玛)。随着马尔可夫链蒙特卡罗扫描技术的帮助下,我们同时改变所有相关参数,并推导出贝叶斯后验概率图。我们发现,μ>0的情况仍然是有利的,而对于μ<0,要找到一个好的全局拟合当前约束要困难得多。在这两种情况下,我们发现一个焦点区域的强烈偏好。这使得在直接搜索中探测中性伴子暗物质的前景得到改善,而在LHC中的超伴子搜索变得更加困难,特别是当μ<0时。相比之下,在Tevatron和LHC探索最轻希格斯玻色子的整个质量范围的前景仍然非常好,这应该与暗物质搜索一起,允许人们进入否则具有实验挑战性的焦点区域。我们还采用了另一种衡量平均拟合质量的方法,这意味着目前的数据还没有足够的约束力来得出更明确的结论。我们还评论我们的结果的选择先验和其他一些假设的依赖。

英文摘要:

We re-examine the properties of the Constrained MSSM in light of updated constraints, paying particular attention to the impact of the recent substantial shift in the Standard Model prediction for BR(B to X_s gamma). With the help of a Markov Chain Monte Carlo scanning technique, we vary all relevant parameters simultaneously and derive Bayesian posterior probability maps. We find that the case of μ>0 remains favored, and that for μ<0 it is considerably more difficult to find a good global fit to current constraints. In both cases we find a strong preference for a focus point region. This leads to improved prospects for detecting neutralino dark matter in direct searches, while superpartner searches at the LHC become more problematic, especially when μ<0. In contrast, prospects for exploring the whole mass range of the lightest Higgs boson at the Tevatron and the LHC remain very good, which should, along with dark matter searches, allow one to gain access to the otherwise experimentally challenging focus point region. An alternative measure of the mean quality-of-fit which we also employ implies that present data are not yet constraining enough to draw more definite conclusions. We also comment on the dependence of our results on the choice of priors and on some other assumptions.

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