D~*Dρ and B~*Bρ strong couplings in light-cone sum rules |
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摘 要: |
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收稿时间: | 2020-07-01 |
D*Dρ and B*Bρ strong couplings in light-cone sum rules |
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Authors: | Chao Wang Hua-Dong Li |
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Institution: | 1. School of physics, Nankai University, Weijin Road 94, Tianjin 300071, China2. Institute of High Energy Physics, CAS, P.O. Box 918, Beijing 100049, China3. School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | We present an improved calculation of the strong coupling constants g_(D~*Dp) and g_(B~*Bp) in light-cone sum rules, including one-loop QCD corrections of leading power with 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. |
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Keywords: | strong couplings light-cone sum rules double dispersion relation |
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