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arXiv 1608.03288hep-phhep-ex
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美重子多体衰变中的CP破坏

CP violation in multibody decays of beauty baryons

Gauthier Durieux

摘要:

在LHCb探测器中大量观察到美丽重子。因此,它们的多体衰变的丰富的运动学分布变得容易获得,并为我们提供了新的机会,寻找CP破坏。本文用Jacob-Wick螺旋度理论分析了自旋$1/2$重子的三体和四体衰变的角分布。值得注意的是讨论的不对称性,提供访问CP-奇相位之间的衰减幅度相同的CP-偶相位的小差异。对具有特定共振中间态的过程的理解使我们能够确定哪些不对称性与什么目的有关。例如,它表明,一些CP-奇角不对称测量的LHCb合作在$Λ_b \to Λ\,φ\to p\,π\, K^+ K^-$衰变预计消失相同。

英文摘要:

Beauty baryons are being observed in large numbers in the LHCb detector. The rich kinematic distributions of their multibody decays are therefore becoming accessible and provide us with new opportunities to search for CP violation. We analyse the angular distributions of some three- and four-body decays of spin-$1/2$ baryons using the Jacob-Wick helicity formalism. The asymmetries that provide access to small differences of CP-odd phases between decay amplitudes of identical CP-even phases are notably discussed. The understanding gained on processes featuring specific resonant intermediate states allows us to establish which asymmetries are relevant for what purpose. It is for instance shown that some CP-odd angular asymmetries measured by the LHCb collaboration in the $Λ_b \to Λ\,φ\to p\,π\, K^+ K^-$ decay are expected to vanish identically.

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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