论文标题
在类似矢量的夸克模型中解释$ W $质量异常
Interpreting the $W$ mass anomaly in the vector-like quark models
论文作者
论文摘要
CDF协作对$ W $ -BOSON质量的新测量结果表明，标准模型（SM）预测的$7σ$不同意。如果通过其他实验确认，则分歧强烈表明SM以外的新物理学存在。在这项工作中，研究了SM的七个矢量夸克（VLQ）扩展以解释异常，发现三个可以解释宽参数空间中的异常。这些解释与斜参数的约束，LHC搜索VLQ，顶部夸克，底部夸克和Higgs Boson的属性的测量以及扰动标准一致。相关Yukawa耦合的典型尺寸约为1，与SM中的顶级Quark Yukawa耦合相当。但是，其他扩展要么预测合理参数空间中质量的负校正，要么通过不自然的理论输入参数来解释异常。
The new measurement of $W$-boson mass by the CDF collaboration revealed a remarkable $7σ$ disagreement with the Standard Model (SM) prediction. If confirmed by other experiments, then the disagreement strongly indicates the existence of new physics beyond the SM. In this work, seven vectorlike quark (VLQ) extensions of the SM are investigated to interpret the anomaly, and it is found that three can explain the anomaly in broad parameter space. The explanations are consistent with the constraints from oblique parameters, the LHC search for VLQs, the measurements of the properties for the top quark, bottom quark, and Higgs boson, and the perturbativity criterion. The typical size of the involved Yukawa coupling is around 1, which is comparable to the top quark Yukawa coupling in the SM. The other extensions, however, either predict a negative correction to the mass in reasonable parameter space or explain the anomaly by unnatural theoretical input parameters.
