Mass effects in muon and semileptonic b-->c decays.
Mass effects in muon and semileptonic b-->c decays.
复制标题
μ 子和半轻子 b-->c 衰变中的质量效应。
DOI：
10.1103/physrevlett.100.241807
复制
发表时间：
2008
影响因子：
8.6
通讯作者：
A. Czarnecki
中科院分区：
文献类型：
--
作者：
A. Pak;A. Czarnecki
计算了半轻子衰变B-->clnu中的量子色动力学（QCD）效应，耦合常数O（α（s）{2}）为二阶，夸克质量m{c}/m{B}为几阶.计算了总衰变率的修正以及轻子能量和强子系统能量分布的前两个矩的修正。转换成QED并应用于μ子衰变，它们将其预测的速率降低了-0.43 ppm。
Quantum chromodynamics (QCD) effects in the semileptonic decay b-->clnu are evaluated to the second order in the coupling constant, O(alpha(s){2}), and to several orders in the expansion in quark masses, m{c}/m{b}. Corrections are calculated for the total decay rate as well as for the first two moments of the lepton energy and the hadron system energy distributions. Translated into QED and applied to the muon decay, they decrease its predicted rate by -0.43 ppm.