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arXiv 0911.2389hep-ph
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具有新Z宇称和暗物质的小Higgs模型

Little Higgs model with new Z-parity and Dark matter

C. S. Kim, Jubin Park

摘要:

我们已经知道,具有T宇称的小希格斯模型,可以给出一个暗物质候选者,通过Wess-Zumino-Witten项,它会受到给定模型的异常的影响,这反过来又会违反T宇称。因此,在这里我们引入一种新的离散对称性,称为Z宇称,它是小希格斯模型的扩展规范群的额外U(1)对称性的剩余规范对称性。由于Z宇称来自规范对称性,这种离散对称性不仅在异常下保持不破缺,而且可以给出最轻的Z宇称粒子,它是稳定的,成为可行的暗物质候选者。我们还表明,有一个允许的参数空间中的全球对称性破缺尺度f对质量的暗物质,满足当前的遗迹密度的冷暗物质。

英文摘要:

It has been known that Little Higgs models with T-parity, which can give a dark matter candidate, suffer from the anomalies of given models through the Wess-Zumino-Witten term, which in turn can violate the T-parity. Here we thus introduce a new kind of discrete symmetry called Z-parity, which is a residual gauge symmetry of an additional U(1) symmetry of the extended gauge group of the Little Higgs models. Because Z-parity comes from the gauge symmetry, this discrete symmetry not only remains unbroken under the anomalies but also can give the lightest Z-parity particle, which is stable and becomes a viable dark matter candidate. We also show that there is an allowed parameter space in the global symmetry breaking scale f versus the mass of the dark matter, which satisfies the current relic density of the cold dark matter.

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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