Complete vectorlike fourth family and new U(1)′ for muon anomalies
Complete vectorlike fourth family and new U(1)′ for muon anomalies
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DOI：
10.1103/physrevd.100.055030
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发表时间：
2019-06
影响因子：
5
通讯作者：
Junichiro Kawamura;S. Raby;A. Trautner
中科院分区：
文献类型：
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作者：
Junichiro Kawamura;S. Raby;A. Trautner
我们考虑标准模型(SM)，它增加了一个规范对称性和一个完整的第四族夸克和轻子，它们关于完整的规范对称性是矢量型的{SU(3)_C}\次{SU(2)_L}\次{U(1)_Y}\次\次{U(1)^\素数}。该模型统一地解释了α(g-2)_u~(-1)衰变和右旋S衰变的实验反常现象。我们发现与SM的偏差很好地符合，同时也符合所有其他SM可观测值。该模型包括一个新的$Z^\素数$规范玻色子，一个$\mathm{U(1)素数}$破缺标量，以及类矢量型轻子，所有这些都具有几个数量级的$100$GeV。这与目前发布的所有高能实验数据是一致的，然而，它似乎很快就可以通过精心设计的未来搜索进行测试。此外，精确的风味实验，特别是更准确的CKM基质元素的直接测定，将允许探索最佳拟合点。
We consider the Standard Model (SM) with the addition of a $\mathrm{U(1)^\prime}$ gauge symmetry and a complete fourth family of quarks and leptons which are vector-like with respect to the full $\mathrm{SU(3)_C}\times \mathrm{SU(2)_L} \times \mathrm{U(1)_Y}\times \mathrm{U(1)^\prime}$ gauge symmetry. The model provides a unified explanation of experimental anomalies in $(g - 2)_\mu$ as well as $b \rightarrow s \ell^+ \ell^-$ decays. We find good fits to the deviations from the SM, while at the same time fitting all other SM observables. The model includes a new $Z^\prime$ gauge boson, a $\mathrm{U(1)^\prime}$-breaking scalar, and vector-like leptons all with mass of order a few $100$ GeV. It is consistent with all currently released high energy experimental data, however, it appears imminently testable with well designed future searches. Also precision flavor experiments, especially more accurate direct determinations of CKM matrix elements, would allow to probe the best fit points.