论文标题
在降低的331型模型中的夸克磁极和染色体偶极矩
Chromomagnetic and chromoelectric dipole moments of quarks in the reduced 331 model
论文作者
论文摘要
在一般的331型型号（RM331）中计算了一般Quark的铬磁偶极矩$ \hatμ_t（q^2）$（q^2）$（q^2）$（q^2）$的一环贡献。有人认为，结果是独立于$ q^2 \ ne 0 $的量规，代表有效的可观察数量。在RM331 $ \ hatμ_t（q^2）中，$从两个重型玻色子$ z'$和$ v^+$和一个新的中性标量玻色子$ h_2 $中获得了新的贡献，以及标准型号Higgs玻色子的新贡献，通过风味变化中性流动。后者也由$ z'$ gauge玻色子和标量玻色子$ h_2 $介导，只要有一个$ cp $ violation阶段，就可以给出非散布的$ \ hat d_t $。分析结果是根据Feynman参数积分和Passarino-Veltman标量函数提出的，这些函数可用于交叉检查数值结果。 $ \hatμ_t（q^2）$和$ \ hat d_t $均经过数值评估，该参数值仍被实验数据的约束允许。发现新的单环贡献的新单环贡献（$ \ hatμ_t（q^2）$的数量级或大于其他标准模型扩展名的数量级或更大，其中$ v^+$ gouge boson的主要贡献来自30-1000 geev gev geev Intever in 30-1000 g的订单，$ m__的订单和a s $ m_的订单均为a $ a} $ a}的订单。至于$ \ hat d_t（q^2）$，它从$ h_2 $交换中获得最大的贡献，并且可以达到$ 10^{ - 20} $的订单的值，该订单比其他标准模型扩展所预测的贡献要小。
The one-loop contributions to the chromomagnetic dipole moment $\hatμ_t(q^2)$ and electric dipole moment $\hat d_t(q^2)$ of the top quark are calculated within the reduced 331 model (RM331) in the general case of an off-shell gluon. It is argued that the results are gauge independent for $q^2\ne 0$ and represent valid observable quantities. In the RM331 $\hat μ_t(q^2)$ receives new contributions from two heavy gauge bosons $Z'$ and $V^+$ and a new neutral scalar boson $h_2$, along with a new contribution from the standard model Higgs boson via flavor changing neutral currents. The latter, which are also mediated by the $Z'$ gauge boson and the scalar boson $h_2$, can give a non-vanishing $\hat d_t$ provided that there is a $CP$-violating phase. The analytical results are presented in terms of both Feynman parameter integrals and Passarino-Veltman scalar functions, which are useful to cross-check the numerical results. Both $\hatμ_t(q^2)$ and $\hat d_t$ are numerically evaluated for parameter values still allowed by the constraints from experimental data. It is found that the new one-loop contributions of the RM331 to $\hat μ_t(q^2)$ are of the same order of magnitude or larger than in other standard model extensions, with the dominant contribution arising from the $V^+$ gauge boson for $\|q\|$ in the 30-1000 GeV interval and a mass $m_{V}$ of the order of a few hundreds of GeVs. As for $\hat d_t(q^2)$, it receives the largest contribution from $h_2$ exchange and can reach values of the order of $10^{-20}$, which is smaller than the contributions predicted by other standard model extensions.
