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arXiv 0810.5068hep-ph
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四场地模型中S参数的单圈修正

One-loop Corrections to the S Parameter in the Four-site Model

Sally Dawson, C. B. Jackson

摘要:

我们计算了四格点无希格斯玻色子模型中S参数的主要手征对数修正。除了标准模型中常见的电弱规范玻色子外,该模型还包含两组重电荷和中性规范玻色子。在连续极限下,后一种规范玻色子可以与具有SU(2)_L \times SU(2)_R \times U(1)_X体规范对称性的扭曲额外维模型的W^ \pm和Z玻色子的第一激发Kaluza-Klein态相一致。我们考虑离域费米子,并表明,离域参数必须从其树水平的理想值进行相当大的调整,以调和实验约束与单圈的结果。因此,费米子的离域并不能解决这类理论中对S参数的巨大贡献的问题,并且对S的重大贡献可能会发生在一个循环中。

英文摘要:

We compute the leading chiral-logarithmic corrections to the S parameter in the four-site Higgsless model. In addition to the usual electroweak gauge bosons of the Standard Model, this model contains two sets of heavy charged and neutral gauge bosons. In the continuum limit, the latter gauge bosons can be identified with the first excited Kaluza-Klein states of the W^\pm and Z bosons of a warped extra-dimensional model with an SU(2)_L \times SU(2)_R \times U(1)_X bulk gauge symmetry. We consider delocalized fermions and show that the delocalization parameter must be considerably tuned from its tree-level ideal value in order to reconcile experimental constraints with the one-loop results. Hence, the delocalization of fermions does not solve the problem of large contributions to the S parameter in this class of theories and significant contributions to S can potentially occur at one-loop.

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