Revisiting the heavy vector quarkonium leptonic widths  

作　　者：Guo-Li Wang Xing-Gang Wu 王国利;吴兴刚(Department of Physics,Hebei University,Baoding 071002,China;Department of Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]Department of Physics,Hebei University,Baoding 071002,China [2]Department of Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics C》2020年第6期34-44,共11页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(NSFC)(11575048,11625520,11847301)。

摘　　要：We revisit the heavy quarkonium leptonic decays ψ(nS)→■^+■^- and Υ(nS)→■^+■^- using the Bethe-Salpeter method.The emphasis is on the relativistic corrections.For the ψ(1S-5S)decays,the relativistic effects are 22-2^+3%,34-2^+5%,41-6^+6%,52-13^+11% and 62-12^+14%,respectively.For the Υ(1S-5S) decays,the relativistic effects are 14-2^+1%,23-3^+0%,20-2^+8%,21-7^+6% and 28-7^+2%,respectively.Thus,the relativistic corrections are large and important in heavy quarkonium leptonic decays,especially for the highly excited charmonium.Our results forΥ(nS)→■^+■^- are consistent with the experimental data.

关 键 词：QUARKONIUM leptonic decay Bethe-Salpeter equation 

分 类 号：O572.3[理学—粒子物理与原子核物理]