D^(+)→a_(0)^(0)(980)lv_(l)过程的形状因子和衰变分支比  

The form factors and branching ratios of D^(+)→a_(0)^(0)(980)lv_(l) process

作　　者：孙艳军 黄琦 赵国华 王斌 洪玮 SUN Yan-jun;HUANG Qi;ZHAO Guo-hua;WANG Bin;HONG Wei(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2021年第6期38-44,共7页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11365018,11375240)。

摘　　要：将轻标量介子a_(0)(980)视为两夸克态,采用光锥求和规则计算了D^(+)→a_(0)^(0)(980)过程的形状因子.由于在关联函数中引入了手征流,形状因子的结果中只保留了2扭度光锥分布振幅的贡献.利用这些形状因子,进一步计算了D^(+)→a_(0)^(0)(980)lv_(l)(l=e,μ)过程的衰变分支比,结果与BESⅢ最近的实验数据具有很好的一致性.The form factors of the D^(+)→a_(0)^(0)(980)process is calculated by light-cone sum rules with the light scalar meson a_(0)(980)being regarded as two-quark state.Due to the introduction of the chiral currents in the correlation function,only the contribution of the twist-2 light-cone distribution amplitude is retained in the final result of the form factors.Using these form factors,the branching ratios of the process D^(+)→a_(0)^(0)(980)lv_(l)(l=e,μ)is obtained,and it is found that our results are in good agreement with recent experimental data of BESⅢ.

关 键 词：光锥求和规则 手征流 形状因子 分布振幅 

分 类 号：O413.3[理学—理论物理]