矢量重味介子的径向激发态  

Radially Excited Vector Heavy Flavor Mesons

作　　者：李作宏[1] 朱明雪 LI Zuo-hong;ZHU Ming-xue(School of Opto-electronic Information Science and Technology,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学光电信息科学技术学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2021年第3期337-341,共5页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：国家自然科学基金资助项目(11847606)。

摘　　要：改进了D*Dπ和B*Bπ基态强耦合常数g_(D*Dπ)和g_(B*Bπ)的计算,首次提出了一个在矢量重味介子径向激发态情况下相应的强耦合常数g_(D*′Dπ)和g B*′Bπ的QCD研究。利用D→π和B→π形状因子的光锥求和规则预言,并结合实验数据先分别拟合基态耦合常数g_(D*Dπ)和g_(B*Bπ),进而将基态耦合常数作为输入参数分别拟合耦合常数g_(D*′Dπ)和g B*′Bπ。数值结果:g_(D*Dπ)=18.40^(+6.42)_(-5.44)和g_(B*Bπ)=44^(+6.09)_(-3.37),g_(D*′Dπ)=-13.30^(+3.09)_(-3.15)和g B*′Bπ=-27.90^(+3.77)_(-3.10)。研究结果可以直接应用于具有一个Dπ末态的B介子两体和三体衰变的理论研究。We make an improved evaluation of the D*Dπ(B*Bπ)strong coupling constant g_(D*Dπ)(g_(B*Bπ))and for the first time,a QCD-based investigation on the corresponding one g_(D*′Dπ)(g B*′Bπ)in the case of the first radially excited state of D*(B*)meson.These nonperturbative quantities are determined by fitting the light-cone QCD prediction combined with the relevant experimental data for D(B)→πweak form factor to its hadronic representation.The results are g_(D*Dπ)=18.40^(+6.42)_(-5.44) and g_(B*Bπ)=44^(+6.09)_(-3.37),g_(D*′Dπ)=-13.30^(+3.09)_(-3.15) and g B*′Bπ=-27.90^(+3.77)_(-3.10),with a numerical prediction in good agreement with the experiment observation in the g_(D*Dπ)case.As well as providing a theoretical insight into QCD dynamics of the radially excited heavy flavor mesons,our findings are immediately appliable to the two-and three-body B decays involving a Dπfinal state.

关 键 词：D*(B*)介子 径向激发态 强耦合常数 QCD光锥求和规则 弱形状因子 

分 类 号：TG376.2[金属学及工艺—金属压力加工]