Gluon TMD fragmentation function into quarkonium

Miguel G. Echevarria, Samuel F. Romera, Ignazio Scimemi

We compute the gluon transverse-momentum-dependent fragmentation function (TMDFF) at next-to-leading order (NLO) into heavy quarkonium in the color-octet ${}^3{S}_1^{[8]}$ channel, bas…