论文标题
CDF II的$ W $质量测量的倾斜课程
Oblique Lessons from the $W$ Mass Measurement at CDF II
论文作者
论文摘要
CDF合作最近报告了对$ W $ BOSON质量$ M_W $的新精确度量，其中心值明显大于SM预测。我们探讨了将这种新测量对标准模型（SM）拟合到Electroweak Precision数据的效果。我们表征了SM与SM的紧张关系，并根据斜参数$ s $，$ t $和$ u $探索了电动部门内SM现象以外的潜力。我们表明，大型$ m_w $ value可以以$ u $的较大的非零值以拟合方式容纳，这在明确的型号中很难构造。假设$ u = 0 $，electroweak拟合强烈更喜欢$ t $的较大的正值。最后，我们研究如何在影响树和环级时影响电动部门的模型的背景下生成倾斜参数的首选值。特别是，我们证明了$ t $和$ s $的首选值可以使用真实的su（2）$ _ l $ $ $三重标量表，不起眼的“ swino”，可以重重以逃避当前的对撞机的约束，也可以通过（多种）单圈式 - doublet-doublet fermion对。我们重点介绍了构建其他简单模型（例如深色光子）的挑战，用于解释大型$ M_W $值，以及多个方向进行进一步研究。
The CDF collaboration recently reported a new precise measurement of the $W$ boson mass $M_W$ with a central value significantly larger than the SM prediction. We explore the effects of including this new measurement on a fit of the Standard Model (SM) to electroweak precision data. We characterize the tension of this new measurement with the SM and explore potential beyond the SM phenomena within the electroweak sector in terms of the oblique parameters $S$, $T$ and $U$. We show that the large $M_W$ value can be accommodated in the fit by a large, nonzero value of $U$, which is difficult to construct in explicit models. Assuming $U = 0$, the electroweak fit strongly prefers large, positive values of $T$. Finally, we study how the preferred values of the oblique parameters may be generated in the context of models affecting the electroweak sector at tree- and loop-level. In particular, we demonstrate that the preferred values of $T$ and $S$ can be generated with a real SU(2)$_L$ triplet scalar, the humble "swino," which can be heavy enough to evade current collider constraints, or by (multiple) species of a singlet-doublet fermion pair. We highlight challenges in constructing other simple models, such as a dark photon, for explaining a large $M_W$ value, and several directions for further study.
