CAJ | 학술논문

基于新的全息AdS/QCDρ介子分布振幅，利用完整QCD光锥求和规则计算了D →ρ半轻跃迁形状因子A 1、A2、A3、V ，并与以前基于传统分布振幅的光锥求和规则、格点计算及最新CLEO实验给出的结果进行了比较。研究表明，所给出的跃迁形状因子整体上与CLEO实验给出的结果符合的更好。在此基础上，我们对 D →ρlν半轻衰变进行了研究，计算了D＋→ρ0 l＋ν、D0→ρ- l＋ν的衰变宽度并结合分值比的最新实验测量值抽取了CKM 矩阵元 V cd 。利用D0→ρ- l＋ν过程抽取的CKM 矩阵元与当前世界平均值符合的很好，D＋→ρ0 l＋ν对应的结果也在误差范围内与世界平均值一致。
기우신적전식AdS/QCDρ개자분포진폭，이용완정QCD광추구화규칙계산료D →ρ반경약천형상인자A 1、A2、A3、V ，병여이전기우전통분포진폭적광추구화규칙、격점계산급최신CLEO실험급출적결과진행료비교。연구표명，소급출적약천형상인자정체상여CLEO실험급출적결과부합적경호。재차기출상，아문대 D →ρlν반경쇠변진행료연구，계산료D＋→ρ0 l＋ν、D0→ρ- l＋ν적쇠변관도병결합분치비적최신실험측량치추취료CKM 구진원 V cd 。이용D0→ρ- l＋ν과정추취적CKM 구진원여당전세계평균치부합적흔호，D＋→ρ0 l＋ν대응적결과야재오차범위내여세계평균치일치。
Based on the new holographic distribution amplitudes (DAs) for ρmeson ,we calculate the D → ρform factors A1 ,A2 ,A3 ,V by using the full QCD light cone sum rules (LCSR) and compare our results with those given by LCSR based on the traditional DAs ,lattice calculation and the latest CLEO experiment .It is found that the form factors presented in this paper are more consistent with the CLEO data .Then we calculate the decay width for D0 → ρ- l+ ν,D+ → ρ0 l+ νand extract the CKM matrix element Vcd by combining with the corresponding branching ratio measurements .The CKM matrix element extracted via D0 → ρ- l+ νis consistent with the current world average value (WAV) and the corresponding result for D+ → ρ0 l+ νalso compatible with WAV .