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arXiv 0806.0890hep-phhep-ex
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Z'玻色子和希格斯玻色子质量

A Z' Boson and the Higgs Boson Mass

Michael S. Chanowitz

摘要:

标准模型拟合倾向于希格斯玻色子的质量值低于LEP II的114 GeV直接下限。如果两个最精确测量的有效弱相互作用混合角的3.2 σ不一致归因于低估的系统误差,则差异是尖锐的。在这种情况下,数据表明新的物理学可以提高希格斯质量的预测值。最简单的可能性之一是Z'玻色子,由于Z-Z'混合的结果,它通常会增加希格斯质量的预测。我们探讨了Z-Z'混合对希格斯质量预测的影响,使用完整的数据集和简化的数据集,省略了弱混合角的强子不对称性测量,这比轻子不对称性测量更有可能低估系统的不确定性。

英文摘要:

The Standard Model fit prefers values of the Higgs boson mass that are below the 114 GeV direct lower limit from LEP II. The discrepancy is acute if the 3.2 sigma disagreement for the effective weak interaction mixing angle from the two most precise measurements is attributed to underestimated systematic error. In that case the data suggests new physics to raise the predicted value of the Higgs mass. One of the simplest possibilities is a Z' boson, which would generically increase the prediction for the Higgs mass as a result of Z-Z' mixing. We explore the effect of Z-Z' mixing on the Higgs mass prediction, using both the full data set and the reduced data set that omits the hadronic asymmetry measurements of the weak mixing angle, which are more likely than the leptonic asymmetry measurements to have underestimated systematic uncertainty.

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