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arXiv 0903.2415hep-ph
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具有监护保护的扭曲额外维的电弱结构和味结构

Electroweak and Flavour Structure of a Warped Extra Dimension with Custodial Protection

Michaela E. Albrecht, Monika Blanke, Andrzej J. Buras, Bjoern Duling, Katrin Gemmler

摘要:

本文给出了具有弯曲额外维和体规范群SU(3)xSU(2)_LxSU(2)_RxPLR xU(1)_X的模型的电弱结构和味结构。SU(2)R的存在意味着Higgs系统中存在一种未破缺的保管对称性,从而可以消除对T参数的较大贡献,而P LR对称性和扩大的费米子表象为SM Z玻色子与左手下型夸克的味对角耦合和味变化耦合提供了保管对称性。我们对角化分析的质量矩阵的带电和中性规范玻色子,包括第一KK模式。给出了包含重KK模的夸克的质量矩阵,讨论了包含轻重场的中性流和带电流。给出了么正规范下相应的完备费曼规则集。

英文摘要:

We present the electroweak and flavour structure of a model with a warped extra dimension and the bulk gauge group SU(3) x SU(2)_L x SU(2)_R x P_LR x U(1)_X. The presence of SU(2)_R implies an unbroken custodial symmetry in the Higgs system allowing to eliminate large contributions to the T parameter, whereas the P_LR symmetry and the enlarged fermion representations provide a custodial symmetry for flavour diagonal and flavour changing couplings of the SM Z boson to left-handed down-type quarks. We diagonalise analytically the mass matrices of charged and neutral gauge bosons including the first KK modes. We present the mass matrices for quarks including heavy KK modes and discuss the neutral and charged currents involving light and heavy fields. We give the corresponding complete set of Feynman rules in the unitary gauge.

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