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arXiv 1302.3542hep-ph
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单Cabibbo抑制D介子衰变中的直接CP破坏

Direct CP violation in singly Cabibbo-suppressed D-meson decays

Joachim Brod

摘要:

LHCb和CDF合作报告了在D 0-> K+ K-和D 0-> pi+ pi-衰变模式中,直接CP不对称性Δ A_CP之间惊人的大差异。我们表明,这种测量可以合理地解释在标准模型的假设下,大企鹅收缩矩阵元素和名义U-自旋破缺。一个一致的图片出现,容纳衰减率之间的巨大差异,和测量的衰减率的D -> K π模式。

英文摘要:

The LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta A_CP, in the D0 -> K+ K- and D0 -> pi+ pi- decay modes. We show that this measurement can be plausibly explained within the standard model under the assumption of large penguin contractions matrix elements and nominal U-spin breaking. A consistent picture arises, accommodating the large difference between the decay rates, and the measured decay rates of the D -> K pi modes.

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