Fragmentation function of g → Q Q ¯ $$ Q\overline{Q} $$ (3 S 1 8 $$ {S}_1^{\left[8\right]} $$ ) in soft gluon factorization and threshold resummation

Abstract

Abstract We study the fragmentation function of the gluon to color-octet 3 S 1 heavy quark-antiquark pair using the soft gluon factorization (SGF) approach, which expresses the fragmentation function in a form of perturbative short-distance hard part convoluted with one-dimensional color-octet 3 S 1 soft gluon distribution (SGD). The short distance hard part is calculated to the next-to-leading order in α s and all orders in velocity expansion. By deriving and solving the renormalization group equation of the SGD, threshold logarithms are resummed to all orders in perturbation theory. The comparison with gluon fragmentation function calculated in NRQCD factorization approach indicates that the SGF formula resums a series of velocity corrections in NRQCD which are important for phenomenological study.

Keywords

• NLO Computations
• Phenomenological Models