摘要: The asymptotic behavior of two weak decay modes of heavy quark-light quark systems (D or B mesons) in the LLA approximation is calculated with the ratio of the heavy quark and light quark M exp 2 /m exp 2 as the large parameter. T... 展开 The asymptotic behavior of two weak decay modes of heavy quark-light quark systems (D or B mesons) in the LLA approximation is calculated with the ratio of the heavy quark and light quark M exp 2 /m exp 2 as the large parameter. The sum of leading logarithm contributions of all orders of the coupling constant g exp 2 gives a Sudakov-like double logarithmic factor. This factor indicates that the standard factorization and renormalization group approach as usually formulated does not work for this process. It may also indicate a suppression of these processes, but further analysis is needed. (ERA citation 08:047832) 收起