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arXiv 2602.01332hep-ph
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在H±→W±Z过程中研究CP violation:2HDM中的物理方法

CP violation in H^\pm \to W^\pm Z: A physical approach for the 2HDM

Birzeit University(比尔宰特大学);Western Norway University of Applied Sciences(挪威西部应用科学大学);University of Bergen(卑尔根大学);Universidade de Lisboa(里斯本大学)

Wafaa Khater, Odd Magne Ogreid, Per Osland, Margarida Nesbitt Rebelo

AI总结:

本文在2HDM框架下研究H±→W±Z过程中的CP violation,通过分析玻色子和费米子环幅值的干涉,揭示了CP violation的来源,并探讨了电荷不对称性的表现。

摘要:

我们研究了在双Higgs双态模型(2HDM)框架下H±→W±Z过程中的CP violation。幅值以物理耦合明确表达。我们的分析定性地确认了Kanemura和Mura最近的结果,关于单环玻色子幅值与费米子幅值之间的干涉。此外,我们识别出额外的CP violation来源,这些来源来自玻色子幅值之间的内部干涉,以及费米子环幅值之间的干涉。在对齐极限下,如果额外中性标量的质量和大于Z的质量,在没有费米子环贡献时,不对称性会消失。我们的结果允许通用的Yukawa耦合,并涵盖显性和自发性CP violation。对于W±和Z衰变,CP violation只会在电荷不对称性中体现。

英文摘要:

We investigate CP violation in the process H^\pm \to W^\pm Z within the framework of the two-Higgs-Doublet model (2HDM). Amplitudes are expressed transparently in terms of physical couplings. Our analysis qualitatively confirms recent results by Kanemura and Mura, for the interference between one-loop bosonic and fermionic amplitudes. Furthermore, we identify additional sources of CP violation arising from internal interference among the bosonic and also among the fermionic loop amplitudes. In the alignment limit, the asymmetry would vanish in the absence of fermionic loop contributions when the sum of the masses of the additional neutral scalars is higher than the mass of the Z. Our results allow for generic Yukawa couplings, and cover both explicit and spontaneous CP violation. For inclusive W^\pm and Z decays, the CP violation will only manifest itself as a charge asymmetry.

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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