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arXiv 2003.12053hep-phhep-ex
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三体$B$衰变中CP破坏的模型分析

CP Violation in Three-body $B$ Decays: A Model Ansatz

Thomas Mannel, Kevin Olschewsky, K. Keri Vos

摘要:

CP破坏的机制一直是粒子物理学的难题之一。理解这一现象的关键是非轻子$B$衰变,特别是在相空间的各个区域表现出大CP不对称性的多体衰变。一个完整的基于QCD的理论描述这些衰变仍然是缺失的,需要使用模型来拟合数据。在本文中,我们提出了一个模型分析,它反映了潜在的物理和已知的机制,CP破坏通过CKM矩阵。此外,由于CP破坏是由价粲夸克和非价粲夸克的振幅之间的干涉驱动的,我们认为开粲阈值的打开可能在高不变质量区产生CP破坏中起重要作用.我们提出了一个自然扩展的等压线模型,将这些影响。我们建议分析非轻子三体$B$衰变数据,包括这个扩展,这将是有趣的,因为它可能会给新的线索的来源CP破坏在低和高不变质量。

英文摘要:

The mechanism of CP violation remains one of the puzzles in particle physics. Key to understanding this phenomenon are nonleptonic $B$ decays, especially multibody decays which exhibit large CP asymmetries in various regions of phase space. A full QCD-based theoretical description of these decays is still missing, requiring the use of models to fit the data. In this paper, we suggest a model ansatz which reflects the underlying physics and the known mechanism of CP violation via the CKM matrix. In addition, since CP violation is driven by the interference between amplitudes with and without valence charm quarks, we argue that the opening of the open-charm threshold may play an important role in generating CP violation in the high invariant mass region. We present a natural extension of the isobar model to incorporate these effects. We suggest an analysis of nonleptonic three-body $B$ decay data including this extension, which would be interesting as it may give new hints to the sources of CP violation both at low and high invariant mass.

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