Improved analysis of the rare decay processes of Λ_(b)  

作　　者：Ren-hao Deng Yong-lu Liu Ming-qiu Huang 

机构地区：[1]College of Art and Science,National University of Defense Technology,Hunan 410073,China

出　　处：《Communications in Theoretical Physics》2021年第10期114-124,共11页理论物理通讯（英文版）

摘　　要：It is noted that in the new Particle Data Group(PDG) version the rare decays of the Λ_(b) baryon have been revised with more accuracy. The new results show that most of the existing theoretical results on the process Λ_(b)→Λ_(γ) Lgbare larger than those of experiments. With the improved higher-order light-cone distribution amplitudes of the Λ baryon, we reanalyze the process in the framework of light-cone quantum chromodynamics sum rules and the branching ratio is estimated to be Br (Λ_(b)→Λ_(γ))=(7.38-0.39+0.40)×10^(16), which is consistent with the new experimental result. Furthermore, another process Λ_(b)→Λl+l- is also analyzed in the same frame. The final branching ratio is calculated to be Br (Λ_(b)→Λl+l-)=1.20×10^(-6), which is in good accordance with the data from the PDG and other theoretical predictions.

关 键 词：light-cone distribution amplitude rare decay light-cone QCD sum rules 

分 类 号：O572.3[理学—粒子物理与原子核物理]