论文标题
$ d \ to v（ω，ρ，k^*）的分支分数和极化
Branching fractions and polarizations of $D\to V(ω,ρ, K^*) \ell ν_\ell$ within QCD LCSR
论文作者
论文摘要
In this paper, we make a detailed study about the $D\to V$ helicity form factors (HFFs) within the framework of QCD light-cone sum rule (LCSR) up to twist-4 accuracy.将HFF的LCSR预测推断到整个物理$ Q^2 $ - 地区之后，我们得到了纵向，横向和总$ | v_ {cq} | $ - 独立衰减的衰减宽度$ d \ d \ to v \ ell^ell^+g n g g+v n+ν_\ ell $。同时，通过使用$ d^0（d^+）$ -Meson Lifetime获得这些衰减的分支分数，这与BES-III II在错误中的结果非常吻合。作为进一步的步骤，我们还研究了最终状态中充电Lepton（vector Meson）极化的差异和平均预测Lepton-side convexity参数$ {\ cal c} _ {\ rm f}^\ ell $。我们的预测与在错误中的协方差限制夸克模型结果一致。因此，我们认为HFFS的LCSR方法适用于处理$ d $ -Meson的半衰减衰减。
In this paper, we make a detailed study about the $D\to V$ helicity form factors (HFFs) within the framework of QCD light-cone sum rule (LCSR) up to twist-4 accuracy. After extrapolating the LCSR predictions of HFFs to the whole physical $q^2$-region, we get the longitudinal, transverse and total $|V_{cq}|$-independent decay widths of semileptonic decay $D\to V\ell^+ν_\ell$. Meanwhile, the branching fractions of these decays are also obtained by using the $D^0(D^+)$-meson lifetime, which agree well with the BES-III results within errors. As a further step, we also investigate the differential and mean predictions for charged lepton (vector meson) polarization in the final state $P_{\rm L,T}^\ell$ ($F_{\rm L,T}^\ell$), the forward-backward asymmetry ${\cal A}_{\rm FB}^\ell$, and the lepton-side convexity parameters ${\cal C}_{\rm F}^\ell$. Our predictions are consistent with Covariant Confining Quark Model results within the errors. Thus, we think the LCSR approach for HFFs is applicable for dealing with the $D$-meson semileptonic decays.
