D*Dρ and B*Bρ strong couplings in light-cone sum rules

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 34-42
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/7/073103

摘要

We present an improved calculation of the strong coupling constants gD·Dρ and gB·Bρ in light-cone sum rules,including one-loop QCD corrections of leading power with ρ meson distribution amplitudes.We further compute subleading-power corrections from two-particle and three-particle higher-twist contributions at leading order up to twist-4 accuracy.The next-to-leading order corrections to the leading power contribution numerically offset the subleading-power corrections to a certain extent,and our numerical results are consistent with those of previous studies on sum rules.A comparison between our results and existing model-dependent estimations is also made.