New physics for muon anomalous magnetic moment and its electroweak precision analysis
New physics for muon anomalous magnetic moment and its electroweak precision analysis
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DOI：
10.1103/physrevd.86.095025
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发表时间：
2012-07
影响因子：
5
通讯作者：
Shunichi Kanemitsu;K. Tobe
中科院分区：
文献类型：
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作者：
Shunichi Kanemitsu;K. Tobe
μ子反常磁矩（μ g-2）的标准模型预测偏差约3 °。我们考虑了标准模型之外的新物理，它具有新的汤川与μ子的相互作用。我们计算了μ介子g-2的新贡献和对电弱观测量的修正，并给出了参数空间的一致区域。我们发现，在一个简单的模型中，μ子的手征翻转只发生在μ子g-2图的外μ子线上，有必要引入相对较大的新Yukawa耦合和电弱尺度的新粒子。另一方面，在一个单圈μ介子g-2图的内费米子线上可以发生手征翻转的模型中，我们可以在没有大的Yukawa耦合的情况下获得有利的g-2贡献，并且它们与精确的电弱观测值是一致的。最后讨论了μ介子g-2的新粒子对Higgs玻色子衰变h →的影响以及这些粒子在LHC实验中的直接产生。
About 3� deviation from the standard model prediction of muon anomalous magnetic moment (muon g-2) has been reported. We consider new physics beyond the standard model which has new Yukawa interactions with muon. We compute new contributions to muon g-2 and corrections to electroweak observables, and show the consistent region of parameter space. We find that in a simple model where the chirality flip of muon occurs only in the external muon line in one-loop muon g-2 diagrams, it is necessary to introduce the relatively large new Yukawa coupling and the electroweak scale new particles. On the other hand, in a model where the chirality flip can occur in the internal fermion line of one loop muon g-2 diagrams, we can obtain favorable g-2 contributions without large Yukawa coupling, and they are consistent with the precision electroweak observables. Finally, we discuss effects of new particles for muon g-2 on the Higgs boson decay h → and direct productions of these particles at the LHC experiment.