Revisiting the minimal Nelson-Barr model

被引：0
作者：
Murai, Kai [1 ]
Nakayama, Kazunori [1 ,2 ]
机构：
[1] Tohoku Univ, Dept Phys, Sendai 9808578, Japan
[2] KEK, Int Ctr Quantum Field Measurement Syst Studies Uni, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2024年 / 11期
关键词：
Vector-Like Fermions; CP Violation; Baryo-and Leptogenesis; STRONG CP PROBLEM; STRONG P; NATURAL SUPPRESSION; T-INVARIANCE; BARYOGENESIS; GAUGE;
D O I：
10.1007/JHEP11(2024)098
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We revisit the minimal Nelson-Barr model for solving the strong CP problem through the idea of spontaneous CP breaking. The minimal model suffers from the quality problem, which means that the strong CP angle is generated by higher-dimensional operators and one-loop effects. Consequently, it has been considered that there is a cosmological domain wall problem and that leptogenesis does not work. We point out that just imposing an additional approximate global symmetry solves the quality problem. We also propose a simple solution to the domain wall problem and show that the thermal leptogenesis scenario works.
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页数：20
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