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arXiv 0905.1022hep-ph
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规范-希格斯统一中的中子电偶极矩

Neutron Electric Dipole Moment in the Gauge-Higgs Unification

Yuki Adachi, C. S. Lim, Nobuhito Maru

摘要:

研究了M^4 \times S^1/Z_2时空中紧化的五维SU(3)规范-Higgs统一体中的中子电偶极矩。指出在规范场-Higgs统一情形下实现CP破坏是一个重要的任务,并讨论了CP对称性是如何被规范场的额外空间分量Higgs的VEV自发破缺的.我们强调了Higgs粒子的VEV和Z_2奇质量项之间的相互作用对物理上得到CP破坏的重要性。然后,我们计算了单圈贡献的中子EDM作为CP违反可观测的典型例子,发现EDM已经出现在单圈水平,而不调用三代方案。然后,我们推导出一个下界的紧化尺度,这是约2.6 TeV,通过比较的贡献,由于非零卡鲁扎-克莱因模式与实验数据。

英文摘要:

We study the neutron electric dipole moment (EDM) in a five dimensional SU(3) gauge-Higgs unification compactified on M^4 \times S^1/Z_2 space-time including a massive fermion. We point out that to realize the CP violation is a non-trivial task in the gauge-Higgs unification scenario and argue how the CP symmetry is broken spontaneously by the VEV of the Higgs, the extra space component of the gauge field. We emphasize the importance of the interplay between the VEV of the Higgs and the Z_2-odd bulk mass term to get physically the CP violation. We then calculate the one-loop contributions to the neutron EDM as the typical example of the CP violating observable and find that the EDM appears already at the one-loop level, without invoking to the three generation scheme. We then derive a lower bound for the compactification scale, which is around 2.6 TeV, by comparing the contribution due to the nonzero Kaluza-Klein modes with the experimental data.

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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