发表机构
CERN(欧洲核子研究中心)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
研究CKM幺正性三角形约束对b列重标度新物理情景不敏感的问题,通过识别平坦方向导出相关约束,发现|ε_K|可约束重标度,当前数据允许一定偏差,K介子部分将成主要探测手段,玩具模型提供原理证明。
AI 中文摘要
CKM幺正性三角形约束对b列被均匀重标度的新物理情景不敏感。这是因为B物理数据过度约束了(bd)幺正性三角形的角度,但仅校准其归一化。我们识别出这个平坦方向并导出了关于重标度的与模型无关的约束。我们发现|ε_K|已经能像b列归一化的直接测量一样约束重标度,当前数据允许有O(4%)的偏差。预计的输入使K介子部分成为主要探测手段。一个采用与矢量类上型单态混合的玩具模型为可能的紫外实现提供了原理证明。
英文摘要
CKM unitarity triangle constraints are insensitive to New Physics scenarios in which the $b$-column is uniformly rescaled. This is because B physics data over-constrain the angles of the (bd) unitarity triangle, but only calibrate its normalization. We identify this flat direction and derive model-independent constraints on the rescaling. We find that $|\varepsilon_K|$ already constrains the rescaling at the same level as the direct measurement of the $b$-column normalization, with current data allowing for ${\cal O}(4\%)$ deviations. Projected inputs promote the kaon sector to be the leading probe. A toy model employing mixing with a vector-like up-type singlet provides a proof of principle for a possible UV realization.