利用波函数研究B_c介子纯轻衰变的QCD非微扰特性

QCD Non-perturbative Study in Radiative and Pure-leptonic Decays of B_c by Wave Function

Bc介子辐射性纯轻衰变的理论计算具有很大的强子型不确定性。利用3种类型的Bc介子波函数描述这种纯轻衰变的QCD非微扰特性,并通过控制函数中参数的变化在理论上详细地计算了由介子波函数而引起的Bc介子辐射性纯轻衰变的这种强子型的不确定性。结果表明,介子波函数的形式对计算的衰变结果有非常明显的影响,该过程的分支比可在1.819 81×10-5～3.189 61×10-5间变化。

The radiative and pure-leptonic decays of Bc mesons are of hadrons uncertainty in theoretical cal- culations. Using three types of the Bc meson wave functions which describe the characteristics of the QCD non-perturbative and by controlling the parameters in them, the uncertainties of Bc meson decay caused by the hadron decay model are studied in detail. The theoretical results show the branching ratios are （1. 819 8143. 189 61）×10^-5 , which are sensitive to the type of wave functions.