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arXiv 2209.08320hep-ph
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类矢量夸克模型中的$W$ -质量反常解释

Interpreting the $W$-mass anomaly in the vectorlike quark models

Junjie Cao, Lei Meng, Liangliang Shang, Shiyu Wang, Bingfang Yang

摘要:

CDF合作组对$W$ -玻色子质量的新测量结果显示,$7σ$与标准模型(SM)的预测存在显著的不一致。如果得到其他实验的证实,那么这种不一致强烈地表明在SM之外存在新的物理学。在这项工作中,七个矢量夸克(VLQ)扩展的SM调查解释的异常,发现三个可以解释的异常在广泛的参数空间。这些解释与斜参数的约束、LHC对VLQ的搜索、顶夸克、底夸克和希格斯玻色子的性质测量以及微扰性判据是一致的。所涉及的汤川耦合的典型大小约为1,这与SM中的顶夸克汤川耦合相当。然而,其他的扩展,要么预测在合理的参数空间的质量负修正或解释异常的非自然的理论输入参数。

英文摘要:

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.

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