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arXiv 1107.3642hep-phnucl-ex
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四代标准模型中的中子EDM

Neutron EDM in Four Generation Standard Model

Junji Hisano, Wei-Shu Hou, Fanrong Xu

摘要:

如果第四代夸克存在的话,它可能为宇宙的重子不对称性提供足够的CP破坏。我们估计了第四代中子的电偶极矩,发现它将由奇异夸克色电偶极矩主导,假设它不会被Peccei-Quinn对称性消除。我们考虑了三圈电弱胶子贡献和两圈电弱胶子/一圈胶子贡献。用m_{b'},m_{t'}在500 GeV左右,可以覆盖在大型强子对撞机上,并与新物理学在b到s跃迁的暗示相一致的Jarlskog CPV因子,中子EDM被发现在10^{-31}e cm左右,仍然远远低于正在计划或正在建设的新实验的10^{-28}e cm范围。

英文摘要:

A fourth generation of quarks, if it exist, 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 CPV factor that is consistent with hints of New Physics in b to s transitions, the neutron EDM 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.

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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