Strong vertices of bottom mesons B and B^(*) and bottomonia Υ,ηb  

作　　者：卢杰 于国梁 王志刚 吴彬 Jie Lu;Guo-Liang Yu;Zhi-Gang Wang;Bin Wu(Department of Mathematics and Physics,North China Electric Power University,Baoding 071003,China;Hebei Key Laboratory of Physics and Energy Technology,North China Electric Power University,Baoding 071000,China)

机构地区：[1]Department of Mathematics and Physics,North China Electric Power University,Baoding 071003,China [2]Hebei Key Laboratory of Physics and Energy Technology,North China Electric Power University,Baoding 071000,China

出　　处：《Chinese Physics C》2024年第1期17-28,共12页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(12175068);Natural Science Foundation of Hebei Province,China(A2018502124)。

摘　　要：In this study,the strong coupling constants of vertices BBΥ,BB^(∗)Υ,B^(∗)B^(∗)Υ,BB^(∗)ηb,and B^(∗)B^(∗)ηb are analyzed in the framework of QCD sum rules.All possible off-shell cases and the contributions of vacuum condensate terms including<qq>,<(qgsσGq>,<g_(s)^(2)G^(2)>,<f^(3)G^(3)>,and<qq><g_(s)^(2)G^(2)>are considered.The momentum dependent strong coupling constants are first calculated and then fitted into the analytical function g(Q^(2)),which is extrapolated to time-like regions to obtain the final values of strong coupling constants.The final results are gBBΥ=40.67+7.55−4.20,gBB^(∗)Υ=11.58+2.19−1.09 GeV−1,gB^(∗)B^(∗)Υ=57.02+5.32−5.31,gBB^(∗)ηb=23.39+4.74−2.30,and gB^(∗)B^(∗)ηb=12.49+2.12−1.35 GeV−1.These strong coupling constants are important input parameters that reflect the dynamic properties of the interactions among the mesons and quarkonia.

关 键 词：bottom meson strong coupling constants QCD sum rules 

分 类 号：O572.2[理学—粒子物理与原子核物理]