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arXiv 2302.03094hep-ph
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限制由4阶CP对称性诱导的FCNC

Limiting FCNC induced by a CP symmetry of order 4

Duanyang Zhao, Igor P. Ivanov, Roman Pasechnik, Pengming Zhang

AI总结:

针对基于4阶CP对称性的三希格斯二重态模型CP4 3HDM中不可避免产生的树级FCNC能否被充分抑制的问题,研究人员开发高效扫描程序,发现8种汤川区中仅2种符合介子振荡约束,为后续唯象扫描提供指引。

摘要:

CP4 3HDM是基于4阶$CP$对称性(CP4)的三希格斯二重态模型。施加CP4会在标量区和汤川区之间建立显著关联,且不可避免地产生树级味改变中性耦合(FCNC)。目前尚不清楚CP4 3HDM中的FCNC能否被充分抑制。本文系统探究了这一问题。我们首先开发了一种高效扫描程序,该程序以夸克质量和混合为输入,用物理夸克可观测量和夸克转动参数表示FCNC矩阵。这一程序使我们能够探究CP4 3HDM中所有可能的汤川区的FCNC效应。我们发现,在8种可能的CP4汤川区中,仅有2种情形与$K$、$B$、$B_s$介子,尤其是$D$介子振荡的约束相容。本研究结果为该模型未来的唯象扫描提供了明确指引。

英文摘要:

CP4 3HDM is a three-Higgs-doublet model based on the $CP$ symmetry of order 4 (CP4). Imposing CP4 leads to remarkable connections between the scalar and Yukawa sectors and unavoidably generates tree-level flavor-changing neutral couplings (FCNC). It remains unclear whether FCNC can be sufficiently suppressed in the CP4 3HDM. In this paper, we systematically explore this issue. We first develop an efficient scanning procedure which takes the quark masses and mixing as input and expresses the FCNC matrices in terms of physical quark observables and quark rotation parameters. This procedure allows us to explore the FCNC effects for all the Yukawa sectors possible within the CP4 3HDM. We find that, out of the eight possible CP4 Yukawa sectors, only two scenarios are compatible with the $K$, $B$, $B_s$ and, in particular, $D$-meson oscillation constraints. The results of this work serve as clear guidelines for future phenomenological scans of the model.

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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