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arXiv 0811.0086hep-ph
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自然顶色辅助人工色模型的电弱手征拉格朗日量

Electroweak Chiral Lagrangian from Natural Topcolor-assisted Technicolor Model

Jun-Yi Lang, Shao-Zhou Jiang, Qing Wang

摘要:

在前人研究的基础上,将C.T.Hill的顶色辅助人工色模型推广到K.Lane的自然顶色辅助人工色模型。我们发现该模型的典型特征与Hill模型的特征在性质上相似,但Lane模型更倾向于较小的Technicolor群,Z'质量必须小于400GeV,而且S参数大约为+1量级,这主要是由于存在三个技术夸克对。我们得到了电弱手征拉格朗日量直到p^4阶的所有系数的值。除了负的大的四费米子耦合值,ETC对电弱手征拉格朗日系数的影响很小,因为决定这些系数的技术夸克自能一般几乎不受ETC诱导的四费米子相互作用的影响,除了它的大动量尾。

英文摘要:

Based on previous studies computing coefficients of the electroweak chiral Lagrangian from C.T.Hill's schematic topcolor-assisted technicolor model, we generalize the calculation to K.Lane's prototype natural topcolor-assisted technicolor model. We find that typical features of the model are qualitatively similar as those of Hill's model, but Lane's model prefers smaller technicolor group and Z' mass must be smaller than 400GeV, further S parameter is around order of +1 mainly due to existence of three doublets of techniquarks. We obtain the values for all coefficients of the electroweak chiral Lagrangian up to order of p^4. Apart from negative large four fermion coupling values, ETC impacts on the electroweak chiral Lagrangian coefficients are small, since techniquark self energy which determines these coefficients in general receives almost no influence from ETC induced four fermion interactions except for its large momentum tail.

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