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arXiv 2601.04529hep-phhep-th
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$S^\prime_4$夸克味模型在固定点$τ= i\infty$附近

$S^\prime_4$ Quark Flavour Model in the Vicinity of the Fixed Point $τ= i\infty$

INFN/SISSA;Kavli IPMU (WPI), UTIAS, The University of Tokyo(理化学研究所 Kavli 宇宙粒子与天体物理研究所(WPI),东京大学 UTIAS);Department of Physics, Niigata University(新潟大学物理学系);Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences(保加利亚科学院核研究与核能研究所)

S. T. Petcov, M. Tanimoto

AI总结:

基于$S^\prime_4$模对称性,该研究在固定点$τ= i\infty$附近构建了能解释夸克质量层级、混合及CP破坏的夸克味模型,并通过统计分析验证其现象学可行性。

摘要:

我们采用自下而上的框架,研究在不进行微调的情况下生成夸克质量层级、夸克混合及CP破坏(CPV)的可能性。该模型具有$S^\prime_4$模对称性,并且参数数量最少。模型在固定点$τ_\text{T}= i\infty$附近考虑,$τ_\text{vev} \sim τ_\text{T}$,其中$τ_\text{vev}$是模$τ$的真空期望值(VEV),这允许解释夸克质量的层级。十个夸克可观测量由九个实参数描述。CP对称性被显式破坏,因为众所周知,在自发破坏CP对称性的类最小模夸克味模型中,通过$τ_\text{vev}$重现观测到的CPV在夸克扇区中是非常有挑战性的(在不进行微调的情况下解释夸克质量层级)。我们对模型进行了统计分析,显示其在现象学上是可行且一致的,特别是与“包容”衰变数据上的$|V_{ub}|$和$|V_{cb}|$元素的CKM矩阵值一致,并且在超对称破缺非常高的尺度下,与当前“平均”实验值的$|V_{ub}|$和$|V_{cb}|$一致。

英文摘要:

We study in the bottom-up framework the possibility to generate the quark mass hierarchies without fine-tuning, the quark mixing and CP-violation (CPV) in a flavour model with $S^\prime_4$ modular symmetry having minimal number of parameters. The model is considered in the vicinity of the fixed point $τ_\text{T}= i\infty$, $τ_\text{vev} \sim τ_\text{T}$, $τ_\text{vev}$ being the vacuum expectation value (VEV) of the modulus $τ$, which allows to explain the hierarchies of the quark masses. The ten quark observables are described by nine real parameters. The CP-symmetry is broken explicitly since, as is well known, reproducing the observed CPV in the quark sector in the case of spontaneous breaking of CP-symmetry by $τ_\text{vev}$ is highly problematic in the class of minimal modular quark flavour models (explaining the quark mass hierarchies without fine-tuning) of the type we consider. We perform a statistical analysis of the model and show that it is phenomenologically viable and consistent, in particular, with the ``inclusive'' decay data on the $|V_{ub}|$ and $|V_{cb}|$ elements of the CKM matrix and, in the case of a very high scale of supersymmetry breaking, with the current ``average'' experimental values of $|V_{ub}|$ and $|V_{cb}|$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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