发表机构
Institute of Theoretical Physics, College of Physics and Electronic Engineering, Northwest Normal University; Institute of Modern Physics, Chinese Academy of Sciences; Lebedev Physical Institute, Russian Academy of Sciences; General Education Center, Qinghai Institute of Technology; School of Nuclear Science and Technology, University of Chinese Academy of Sciences; CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences; Lanzhou Center for Theoretical Physics, Lanzhou University（西北师范大学物理与电子工程学院理论物理研究所; 中国科学院近代物理研究所; 俄罗斯科学院列别杰夫物理研究所; 青海理工学院公共教学中心; 中国科学院大学核科学与技术学院; 中国科学院近代物理研究所高精度核谱学国家重点实验室; 兰州大学兰州理论物理中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究用带手征流的QCD光锥求和规则，结合BLFQ等方法研究D→π半轻子衰变的跃迁形状因子，结果与BESIII等数据吻合，为抽取CKM矩阵元等提供新途径。
AI 中文摘要
我们利用基于手征流的QCD光锥求和规则，对半轻子衰变$D\rightarrow Pe^{+}v_{e}$和$D\rightarrow P\bar{\nu}_{\tau}$的跃迁形状因子开展系统研究，重点关注π介子的非微扰结构。分析并将π介子的分布振幅（包括twist-2及更高twist分量）纳入计算，采用了Gegenbauer多项式展开和基光前量子化（BLFQ）方法，其中BLFQ方法得到的分布会快速收敛到渐近形式。推导了两个联系跃迁形状因子的关系，发现其与QCD的手征对称性一致。我们对D到π形状因子的数值预测与BESIII测量结果及格点QCD计算吻合良好；由此得到的D到π衰变的微分衰变宽度，在高动量转移（$q$）区域（$q^2>1\rm{GeV^2}$）也与BESIII数据一致，为精确抽取CKM矩阵元、探索超出标准模型的物理提供了新机遇。
英文摘要
We present a systematic study of the transition form factors for the semileptonic decays $D\rightarrow Pe^{+}v_{e}$ and $D\rightarrow Pμ^{+}\bar{v}_μ$ using QCD light-cone sum rules with chiral currents, with emphasis on the nonperturbative structure of the pion. The distribution amplitudes of the meson $π$, including twist-2 and higher-twist components, are analyzed and incorporated in our computation, employing both Gegenbauer polynomial expansions and the Basis Light-Front Quantization (BLFQ) method, where the latter yields a distribution that rapidly converges to the asymptotic form. Two relations linking transition form factors are derived and found to be consistent with the chiral symmetry of QCD. Our numerical predictions for the $D$-to-pion form factors agee well with BES\uppercase\expandafter{\romannumeral3} measurements and lattice QCD calculations. Furthermore, the differential decay widths obtained thereby for the $D$-to-pion decay also show consistency with the BES\uppercase\expandafter{\romannumeral3} data in the high-momentum-transfer ($q$) region with the $q^{2}>1\ \rm{GeV^2}$, implying new opportunities for the precise extraction of the CKM matrix element and the exploration of physics beyond the Standard Model.
Journal refPhys.Rev.D 114, 074002(2026)
