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arXiv 0905.2488hep-ph
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用Gfitter实现电弱标准模型的全局拟合

Global Fits of the electroweak Standard Model and beyond with Gfitter

Martin Goebel

摘要:

在全球拟合的标准模型使用Gfitter,电弱精密观测以及直接希格斯粒子搜索的约束进行了比较,与国家的最先进的电弱预测。我们使用最新的结果在LEP和Tevatron上进行直接Higgs搜索以及最新的m_t和M_W测量。给出了希格斯玻色子的质量估计(M_H=116.3 + 15.6 - 1.3 GeV)和强耦合常数的四阶结果(α_S(M_Z^2)=0.1193 +-0.0028(exp)+-0.0001(theo))。为了约束物理学超越标准模型,执行倾斜参数(STU)到电弱数据的拟合。例如,具有T宇称的最小希格斯模型的参数空间可以通过斜参数来限制。此外,一个扩展的希格斯部门(2 HDM)主要使用从B和K物理观测模型的拟合结果。

英文摘要:

In the global fit of the Standard Model using Gfitter, electroweak precision observables as well as constraints from direct Higgs searches have been compared with state-of-the-art electroweak predictions. We use the most recent results for direct Higgs searches at LEP and Tevatron and the latest measurements of m_t and M_W. Example results are an estimation of the mass of the Higgs boson (M_H=116.3 +15.6 -1.3 GeV) and a forth-order result for the strong coupling constant (alpha_S(M_Z^2)=0.1193 +-0.0028(exp) +-0.0001(theo)). A fit of the oblique parameters (STU) to the electroweak data is performed, in order to constrain physics beyond the Standard Model. For instance, the parameter space of the Littlest Higgs Model with T-parity can be restricted via the oblique parameters. In addition, fit results for a model with an extended Higgs sector (2HDM) using mainly observables from the B and K physics are presented.

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