arXiv 1107.09752011-07hep-ph

整体电弱拟合的最新进展及对新物理的约束

Updated Status of the Global Electroweak Fit and Constraints on New Physics

M. Baak, M. Goebel, J. Haller, A. Hoecker, D. Kennedy, K. Moenig, M. Schott, J. Stelzer

备注：: 58 pages, 27 figures, published version
发表信息：: Eur.Phys.J. C72 (2012) 2003
DOI：: 10.1140/epjc/s10052-012-2003-4

摘要：

我们提出了一个更新的标准模型适合电弱精密数据。包括LEP、Tevatron和LHC的顶夸克质量、W质量和宽度以及希格斯玻色子玻色子质量边界的最新实验结果。我们还包括一个新的确定在Z极的电磁耦合强度。当不包括和包括直接Higgs搜索时，我们分别发现希格斯玻色子的质量为（91 + 30 - 23）GeV和（120 + 12 - 5）GeV。由后者的拟合，我们间接地确定了W的质量为（80.360 + 0.014 - 0.013）GeV。我们利用这些数据来确定斜真空极化参数的实验约束，并面对这些预测从标准模型（SM）和选定的SM扩展。通过将斜参数拟合到电弱数据，我们得到了BSM参数空间中的允许区域。我们重新审视并不断更新这些限制的第四个第四代费米子，两个希格斯偶极子，惰性希格斯和最小的希格斯模型，模型与大，普遍或扭曲的额外维度和technicolour。在所研究的大多数模型中，重希格斯玻色子可以与电弱精确数据兼容。

英文摘要：

We present an update of the Standard Model fit to electroweak precision data. We include newest experimental results on the top quark mass, the W mass and width, and the Higgs boson mass bounds from LEP, Tevatron and the LHC. We also include a new determination of the electromagnetic coupling strength at the Z pole. We find for the Higgs boson mass (91 +30 -23) GeV and (120 +12 -5) GeV when not including and including the direct Higgs searches, respectively. From the latter fit we indirectly determine the W mass to be (80.360 +0.014 -0.013) GeV. We exploit the data to determine experimental constraints on the oblique vacuum polarisation parameters, and confront these with predictions from the Standard Model (SM) and selected SM extensions. By fitting the oblique parameters to the electroweak data we derive allowed regions in the BSM parameter spaces. We revisit and consistently update these constraints for a fourth fourth fermion generation, two Higgs doublet, inert Higgs and littlest Higgs models, models with large, universal or warped extra dimensions and technicolour. In most of the models studied a heavy Higgs boson can be made compatible with the electroweak precision data.

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