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arXiv 2204.04559hep-ph
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右手中微子与CDF II异常

Right-handed neutrinos and the CDF II anomaly

Mattias Blennow, Pilar Coloma, Enrique Fernández-Martínez, Manuel González-López

摘要:

我们指出,右手中微子可以解决最新的CDF II测量的$W$ -玻色子质量,$M_W$,和标准模型之间的紧张关系。积分出的新的状态产生一个单一的$d=6$运营商,这将导致偏离的PMNS矩阵的幺正性。这改变了从μ子衰变中提取费米常数的方法,并增加了对$M_W$的预测,与CDF II的结果一致。PMNS矩阵的非么正性也会影响β、介子和τ衰变。我们发现,$M_W$的CDF II值可以解释不与轻子味普适性约束或不可见的衰变宽度的$Z$冲突。然而,如果右手中微子是$d=6$算符的起源,那么所谓的卡比博角异常就会恶化。如果算子系数不受约束,情况会有所改善,这意味着新物理学的额外来源,但对这两种异常现象的共同解释与普适性界限存在紧张关系。

英文摘要:

We point out that right-handed neutrinos can resolve the tension between the latest CDF II measurement of the $W$-boson mass, $M_W$, and the standard model. Integrating out the new states yields a single $d=6$ operator, which induces a deviation from unitarity in the PMNS matrix. This alters the extraction of the Fermi constant from muon decay and increases the prediction for $M_W$, in line with the CDF II result. Non-unitarity of the PMNS matrix would also affect beta, meson, and tau decays. We find that the CDF II value for $M_W$ can be explained without conflicting with lepton flavour universality constraints or the invisible decay width of the $Z$. However, the so-called Cabibbo angle anomaly is worsened if right-handed neutrinos are the origin of the $d=6$ operator. The situation improves if the operator coefficient is left unconstrained, implying additional sources of new physics, but a common explanation of both anomalies is in tension with universality bounds.

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