Soft-Gluon Resummation for Bottom Fragmentation in Top Quark Decay
Soft-Gluon Resummation for Bottom Fragmentation in Top Quark Decay
复制标题
顶夸克衰变中底部碎裂的软胶子恢复
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Mitov
中科院分区：
文献类型：
--
作者：
M. Cacciari;G. Corcella;A. Mitov
在微扰碎裂函数的框架下，我们研究了顶夸克衰变中的软胶子辐射。我们给出了b夸克能量分布的结果，在系数函数和微扰碎裂函数的初始条件下，软胶子恢复到次要的对数精度。结果表明，顶夸克衰变的b-夸克能谱有了显著的改善，并且顶夸克衰变的b-夸克能谱对因子化和重整化尺度的依赖性很小。我们通过包含由e+e−数据确定的非微扰信息，在xB和矩空间中给出了一些强子能级的结果。
We study soft-gluon radiation in top quark decay within the framework of perturbative fragmentation functions. We present results for the b-quark energy distribution, accounting for soft-gluon resummation to next-to-leading logarithmic accuracy in both the coefficient function and in the initial condition of the perturbative fragmentation function. The results show a remarkable improvement and the b-quark energy spectrum in top quark decay exhibits very little dependence on factorization and renormalization scales. We present some hadron-level results in both xB and moment space by including non-perturbative information determined from e+e− data.