论文标题
夸张的过程中的柔和对数
Soft logarithms in processes with heavy quarks
论文作者
论文摘要
可以在两个不同的近似方案中在扰动QCD中计算涉及重夸克的可观察物：要么完全保留夸克质量依赖性，要么仅在需要的情况下保留它以调节胶线奇异性。这两个方案具有不同的优点和缺点。特别是，众所周知，在两种方法中，由软排放引起的大对数结构不同。我们在一些细节上研究了这种差异的起源，重点是一些特定的过程。我们表明，这与小质量和软发射极限的非交通性有关。最后，在HIGGS衰减为$ b \ b $ b $对的情况下，在夸克质量依赖完全考虑的方案中，我们执行软排放对数的重新召集到临近领先的精度。
Observables involving heavy quarks can be computed in perturbative QCD in two different approximation schemes: either the quark mass dependence is fully retained, or it is retained only where needed to regulate the collinear singularity. The two schemes have different advantages and drawbacks. In particular, it is known that the structure of large logarithms arising from soft emissions is different in the two approaches. We investigate the origin of this difference in some detail, focussing on a few specific processes. We show that it is related to the non-commutativity of the small-mass and soft-emission limits. Finally, we perform the resummation of soft-emission logarithms to next-to-leading accuracy in the case of Higgs decay into a $b\bar b$ pair, in the scheme in which the quark mass dependence is fully accounted for.
