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轻+重赝标介子半轻衰变的DSE研究

Aug 10, 2022, 5:45 PM
15m
Oral report 强子物理与味物理 Parallel Session VI (2):Hadron and Flavor Physics

Speaker

Dr Zhao-Qian Yao (Nanjing University)

Description

Dyson-Schwinger 方程 (DSEs) 已被广泛地应用于轻+轻、轻+重和重+重介子性质的研究。基于此方法,我们对轻+重介子的每个半轻衰变的形状因子和衰变宽度进行了计算,包括 B_((s))→π(K), D_s→K; D→π,K, K→π 和 B_c→η_c, 𝐽/𝜓。在这些计算中,我们的结果定量地与现有数据一致,并分析了迄今未测量的 D_s→K^0, B ̅s→K^+形状因子。分析给出|𝑉𝑐𝑠 | = 0.974(10),并预言了赝标量介子的所有分支分数比,如B_c→η_c, 𝐽/𝜓 的分支分数比,即𝜏和𝜇末态分支比的比值: R(η_c )= 0.313(22)和R_(J/ψ)= 0.242(47),可以探讨轻子味道的普适性问题。我们的分析证实了标准模型对 R_(J/ψ) 的预言与唯一的实验结果之间存在2𝜎的差异,需要实验进一步验证。

Primary author

Dr Zhao-Qian Yao (Nanjing University)

Co-author

Prof. Craig Roberts (Nanjing University)

Presentation materials

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