Updating the neutron electric dipole moment in a fourth generation standard model

被引：0

作者：

Hisano, Junji ^{[1
,2
]}

Hou, Wei-Shu ^{[3
,4
]}

Xu, Fanrong ^{[3
]}

机构：

[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan

[2] Univ Tokyo, TODIAS, IPMU, Kashiwa, Chiba 2778583, Japan

[3] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[4] Natl Taiwan Univ, Natl Ctr Theoret Sci, Taipei 10617, Taiwan

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 09期

关键词：

KOBAYASHI-MASKAWA MODEL; CP-VIOLATION; QUARK;

D O I：

10.1103/PhysRevD.84.093005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A fourth generation of quarks, if it exists, may provide sufficient CP violation for the baryon asymmetry of the Universe. We estimate the neutron electric dipole moment in the presence of a fourth generation and find it would be dominated by the strange quark chromoelectric dipole moment, assuming it does not get wiped out by a Peccei-Quinn symmetry. Both the three electroweak loop and the two-loop electroweak/one-loop gluonic contributions are considered. With m(b'), m(t') at 500 GeV or so that can be covered at the LHC, and with a Jarlskog CP violation factor that is consistent with hints of New Physics in b -> s transitions, the neutron electric dipole moment is found around 10(-31) e cm, still far below the 10(-28) e cm reach of the new experiments being planned or under construction.

引用

页数：5

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