BSW方案中的模型相关性

在Baner,Stech,Wirbel(BSW)方案中,计算D和B介子弱衰变矩阵元使用了强子模型波函数.分析了几种不同的价夸克模型波函数,研究了它们的性质,正确地应用于计算D和B介子弱衰变过程的分支比.结果表明,在目前的实验误差范围内对于不同的模型波函数,相应地选取合适的a₁和a₂参量都能得到与大多数实验数据相符的预言.因此从理论上进一步探讨弱过程因子化,强子波函数和从实验上提高精度都将有助于研究BSW方案的模型相关性和可靠性.

Model Dependence of the BSW Approach

Hadronic model wavefunctions are applied to calculate hadronic matrix elements of decays of D,B mesons in the Baner-Stech-Wirbel(BSW) approach we have analyzed several different models of valence Pock state wavefunctions, studied their properties and calculated branch ratios of exclusive decays of D, B mesons. The resultsshow that predictions of the different wavefunction models can fit most of the present data within the errors by choosing reasonable al,a2. Therefore, it will be helpful for studying the model dependence and the reliability of the BSW approach from further theoretical investigation on factorization of weak processes and on the hadronic wavefunctions and from the further precisely experimental measurements.