UNITARITY CONSTRAINTS ON CP NONCONSERVATION IN HIGGS-BOSON EXCHANGE

被引：187
作者：
WEINBERG, S
机构：
[1] Theory Group, Department of Physics, Austin, TX 78712, University of Texas
来源：
PHYSICAL REVIEW D | 1990年 / 42卷 / 03期
关键词：
D O I：
10.1103/PhysRevD.42.860
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Bounds are derived for the dimensionless factors that enter in the violation of CP invariance in Higgs-boson exchange. In particular, for the class of theories with two scalar SU(2)×U(1) doublets [plus any other scalars whose expectation values do not break SU(2)×U(1)], the magnitude of the parameter ImZ2, which appears in the dominant neutral-Higgs-boson-exchange contribution to the neutron electric dipole moment, is bounded by 12(r2+r4)12, where r is a ratio of the magnitudes of scalar vacuum expectation values. It is shown that this bound can actually be reached in realistic models. © 1990 The American Physical Society.
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页码：860 / 866
页数：7
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