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arXiv 1106.0163hep-ph
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$Z'$唯象学:手征效应理论与反常抵消相结合的模型无关分析与拟合

$Z'$ Phenomenology: A Model-independent Analysis and Fit in Combination of Chiral Effective Theory and Anomaly Cancellation

Ying Zhang, Zheng Cai

摘要:

为了研究$Z'$唯象模型无关,我们结合手征有效理论与异常取消条件,没有任何其他模型输入。我们专注于$Z'$混合与$γ-Z$在质量和动力学的部分,并计算贡献斜$S,T,U$。三组无反常费米子$U(1)'$电荷参数化了$Z'$与费米子的相互作用。$[U(1)']^3$反常和混合引力规范反常的抵消决定了右手中微子的数量。我们还发现了一个新的电荷分配和Stueckelberg耦合的重整化电磁流之间的关系。对电弱精确观测量的全局拟合表明,混合参数的典型值为$10^{-3}$阶。尽管这个严格的限制,我们得到一个负的$S$参数的贡献。

英文摘要:

To investigate $Z'$ phenomenology model-independent, we combine chiral effective theory with anomaly cancellation conditions without any other model input. We focus on $Z'$ mixings with $γ-Z$ in both mass and kinetic parts and calculate contributions to oblique $S,T,U$. The three sets of anomaly-free fermion $U(1)'$ charges parameterize the $Z'$ interactions with fermions. The cancellation of the $[U(1)']^3$ anomaly and mixing gravitational-gauge anomaly determines the number of right-handed neutrinos. We also find a novel relation between the charge assignments and Stueckelberg coupling in terms of the renormalized electromagnetic current. A global fit to the electroweak precise observables shows that typical values for the mixing parameters are of order $10^{-3}$. In spite of this strict limit, we obtain a negative $S$ parameter contribution.

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