标题： 重新审视电弱手征拉格朗日量 显示英文标题

标题： The electroweak chiral Lagrangian revisited

摘要： 使用一种明显与规范无关的方法，我们表明目前文献中用于电弱手征拉格朗日量的低能常数集合是冗余的。 特别是，通过利用规范场的运动方程，可以选择去除两个对规范玻色子自能有贡献的低能常数。 讨论了这一结果与实验确定的偏斜参数 S、T 和 U 值之间的关系。 然后，我们评估了在全理论和有效理论中规范不变格林函数之间的匹配关系，以标准模型中具有重希格斯玻色子的情况为例，并将独立低能常数的结果与简单技术色模型的结果进行比较。 由于这两种模型中的低能常数模式非常不同，用重希格斯玻色子来模拟任何强相互作用的对称性破缺区可能会产生误导。 从我们的研究中得出结论，目前的电弱精度数据并未真正排除这种强相互作用模型。 显示英文摘要

摘要： Using a manifestly gauge-invariant approach we show that the set of low-energy constants in the electroweak chiral Lagrangian currently used in the literature is redundant. In particular, by employing the equations of motion for the gauge fields, one can choose to remove two low-energy constants which contribute to the self-energies of the gauge bosons. The relation of this result to the experimentally determined values for the oblique parameters S,T and U is discussed. We then evaluate the matching relation between gauge-invariant Green's functions in the full and the effective theory for the case of the Standard Model with a heavy Higgs boson and compare the results for the independent low-energy constants with those for a simple Technicolor model. Since the pattern of the low-energy constants is very different in these two models it may be misleading to mimic any strongly interacting symmetry breaking sector by a heavy Higgs boson. From our investigation we conclude that current electroweak precision data do not really rule out such strongly interacting models.