Charmless b -hadron decays are suppressed in the Standard Model by tiny CKM matrix elements which brings the tree amplitudes to levels comparable with loop amplitudes, and potentially New Physics amplitudes. CP violation measurements using Dalitz plot analyses in multi-body decays allow to disentangle these various contributions. In this document we report about the most recent measurements from LHCb in this sector. Firstly, the study of direct CP asymmetries over the Dalitz plane of the B+→π+h+h− decays and the B+→K+h+h− decays (where h=π,K ), will be presented (through this document the inclusion of charge conjugate is always implied, unless explicitly stated). Then the results obtained studying the B+→pp‾h+ decays will be shown. The measurements of the branching ratio of the B+→Λ‾(1520)p (with Λ‾(1520)→p‾K+ ), of the forward-backward asymmetry of the light meson ( π or K ) in the pp‾ rest frame and of the direct CP asymmetry over the B+→pp‾h+ Dalitz plane will be discussed.
展开▼
机译：在标准模型中，无魅力的b强子衰变被微小的CKM矩阵元素抑制，这使树的振幅达到了与回路振幅以及潜在的新物理振幅相当的水平。在多体衰变中使用Dalitz曲线分析进行的CP违规测量可以消除这些各种影响。在本文档中，我们报告了该领域LHCb的最新测量结果。首先，将介绍在B +→π+ h + h-衰减和B +→K + h + h-h衰减（其中h =π，K）的Dalitz平面上直接CP不对称的研究。除非明确说明，否则总是暗示包含电荷共轭物。然后将显示研究B +→pp‾h +衰减所获得的结果。 pp‾静止帧中B +→Λ‾（1520）p（带有Λ‾（1520）→p‾K +）的分支比，光子介子（π或K）的前后对称性的测量将讨论B +→pp‾h + Dalitz平面上的直接CP不对称性。
展开▼
