The experimental study of quarkonium production in pp collisions will be reviewed in this talk.
We compute the energy dependence of the pt-integrated cross section of directly produced quarkonia in pp collisions at next-to-leading order within the nonrelativistic QCD framework. We treat the pt-integrated and the pt-differential cross sections as two different observables to investigate whether the CO LDMEs extracted from the fits of the pt-differential cross sections can predict the...
Fragmentation function of gluon to the spin-triplet color-singlet S-wave quarkonium has been calculated numerically earlier in 1992. However, the analytical result is absent because of the complex high dimensional integrals. With the development of the high-loop calculation, we consider to solve the problem with the IBP reduction. I will present our method and the final result, which is...
