论文标题
$ d^*dπ$和$ b^*bπ$耦合来自轻单元规则
The $D^*D π$ and $B^*Bπ$ couplings from light-cone sum rules
论文作者
论文摘要
我们使用Pion Light-Cone分布振幅从QCD轻单和$ d^*dπ$和$ b^*bπ$重新计算$ d^*dπ$和$ b^*bπ$。通过考虑Gluon辐射校正到Twist-3项，可以升级从操作员产品扩展计算出的相关函数的准确性。相关函数的双光谱密度，包括$ {\ cal o}（α_s）$和twist-4 lo项的3个术语，首次以分析形式呈现。此表格使我们可以在总和规则的双色散关系中使用各种版本的夸克 - 戴隆二元区域。我们预测$ g_ {d^*dπ} = 14.1^{+1.3} _ { - 1.2} $和$ g_ {b^*bπ} = 30.0^{+2.6} _ { - 2.4} $，当重音量从lattice qcd的重点降低时，将带来轻孔的衰减常数。我们将结果与魅力介子耦合的实验值以及晶格QCD计算进行了比较。
We revisit the calculation of the strong couplings $D^*Dπ$ and $B^*Bπ$ 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 ${\cal O} (α_s)$ 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 $g_{D^*Dπ}=14.1^{+1.3}_{-1.2}$ and $g_{B^*Bπ}=30.0^{+2.6}_{-2.4}$ 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.
