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arXiv 0907.1063hep-ph
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三体Chargino衰变中的CP破坏

CP Violation in Three-Body Chargino Decays

Makiko Nagashima, Ken Kiers, Alejandro Szynkman, David London, Jenna Hanchey, Kevin Little

摘要:

超对称性中的CP破坏会导致超对称粒子衰变的速率不对称性。在这项工作中,我们计算了三体电荷衰变\tilde x ^ \pm_2 \to \tilde x ^\pm_1 HH,\tilde x ^ \pm_2 \to \tilde x ^\pm_1 ZZ,\tilde x ^\pm_2 \to \tilde x ^ \pm_1 W^+ W^-和\tilde x ^ \pm_2 \to波浪号x ^\pm_1 ZH的速率不对称性。每一次衰变都包含了中性希格斯玻色子的贡献,它们可能会进入壳层。这样的贡献得到共振增强;此外,CP不对称性所需的强相位来自交换的希格斯玻色子玻色子的宽度。我们的结果表明,在某些情况下,速率不对称性可以相对较大,同时仍然尊重一些重要的低能边界,如来自B介子的可观测量和电偶极矩。对于我们所考虑的参数,在某些情况下,10%量级的速率不对称是可能的。

英文摘要:

CP violation in supersymmetry can give rise to rate asymmetries in the decays of supersymmetric particles. In this work we compute the rate asymmetries for the three-body chargino decays \tildeχ^\pm_2 \to \tildeχ^\pm_1 HH, \tildeχ^\pm_2 \to \tildeχ^\pm_1 ZZ, \tildeχ^\pm_2 \to \tildeχ^\pm_1 W^+ W^- and \tildeχ^\pm_2 \to tildeχ^\pm_1 ZH. Each of the decays contains contributions mediated by neutral Higgs bosons that can possibly go on shell. Such contributions receive a resonant enhancement; furthermore, the strong phases required for the CP asymmetries come from the widths of the exchanged Higgs bosons. Our results indicate that the rate asymmetries can be relatively large in some cases, while still respecting a number of important low-energy bounds such as those coming from B meson observables and electric dipole moments. For the parameters that we consider, rate asymmetries of order 10% are possible in some cases.

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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