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Relativistic corrections to gluon fragmentation into spin-tripletS-wave quarkonium
Physical Review D
We use the NRQCD factorization formalism to calculate the relativistic corrections to the fragmentation function for a gluon fragmenting into a spin-triplet S-wave heavy quarkonium. We make use of the gauge-invariant formulation of the fragmentation function of Collins and Soper. The color-octet contribution receives a large, negative relativistic correction, while the color-singlet contribution receives a large, positive relativistic correction. The considerable decrease in the color-octetdoi:10.1103/physrevd.69.054003 fatcat:eivdfozaonerhlw4mi6k3hwuei