论文标题
阈值重新调整重夸克到夸克腐烂的分解改善
Improved Factorization for Threshold Resummation in Heavy Quark to Heavy Quark Decays
论文作者
论文摘要
我们考虑重新夸张的夸克效果重新播放到重夸克腐烂，即Q1-> Q2 +（非QCD Partons），其中Q1和Q2是两个不同的重夸克。我们为阈值重新召集光谱构建了一个新的分解方案，该方案使我们能够在所有运动区域中始终如一地评估最终强调不变的质量MX的分布，即MX何时较小，相同的顺序或比最终Quark Q2的质量大。引入了提高系数函数对阈值变量的依赖性，但是，可以通过所谓的统一分区将其降低到该变量的小间隔。我们将改进的方案明确地应用于近距离对数准确度的B-> X_S +伽马衰减。
We consider the resummation of soft-gluon effects in heavy quark to heavy quark decays, namely the processes Q1 -> Q2 + (non QCD partons), where Q1 and Q2 are two different heavy quarks. We construct a new factorization scheme for threshold resummed spectra, which allows us to consistently evaluate the distribution of the final hadron invariant mass mX in all the kinematic regions, i.e. when mX is smaller, of the same order, or larger than the mass of the final quark Q2. A dependence of the Improved Coefficient Function on the threshold variable is introduced, which can however be relegated to a small interval of this variable by means of the so-called Partition of Unity. We explicitly apply our improved scheme to the b -> X_s + gamma decay at next-to-leading logarithmic accuracy.
