Relativistic corrections to gluon fragmentation into spin-triplet<i>S</i>-wave quarkonium
Relativistic corrections to gluon fragmentation into spin-triplet<i>S</i>-wave quarkonium
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 …