Khodjamirian Alexander, Melić Blaženka, Wang Yu-Ming, Wei Yan-Bing
Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, D-57068 Siegen, Germany.
Rudjer Boskovic Institute, Division of Theoretical Physics, Bijenička 54, HR-10000 Zagreb, Croatia.
J High Energy Phys. 2021;2021(3):16. doi: 10.1007/JHEP03(2021)016. Epub 2021 Mar 1.
We revisit the calculation of the strong couplings and from the QCD light-cone sum rules using the pion light-cone distribution amplitudes. The accuracy of the correlation function, calculated from the operator product expansion near the light-cone, is upgraded by taking into account the gluon radiative corrections to the twist-3 terms. The double spectral density of the correlation function, including the twist-2, 3 terms at and the twist-4 LO terms, is presented in an analytical form for the first time. This form allows us to use various versions of the quark-hadron duality regions in the double dispersion relation underlying the sum rules. We predict and when the decay constants of heavy mesons entering the light-cone sum rule are taken from lattice QCD results. We compare our results with the experimental value for the charmed meson coupling and with the lattice QCD calculations.
我们使用π介子光锥分布振幅，重新审视从量子色动力学（QCD）光锥和规则计算强耦合常数 和 。通过考虑胶子对扭度-3项的辐射修正，提高了从光锥附近的算符乘积展开计算出的关联函数的精度。首次以解析形式给出了关联函数的双谱密度，包括扭度-2、扭度-3项以及扭度-4领头阶项。这种形式使我们能够在和规则所基于的双色散关系中使用各种版本的夸克-强子对偶区域。当进入光锥和规则中的重介子衰变常数取自格点量子色动力学（lattice QCD）结果时，我们预测了 和 。我们将我们的结果与粲介子耦合的实验值以及格点量子色动力学计算结果进行了比较。
