Bottomonium Production in the Regge Limit of QCD
  We study bottomonium hadroproduction in proton-antiproton collisions at the Fermilab Tevatron in the framework of the quasi-multi-Regge kinematics approach and the factorization formalism of non-relativistic QCD at leading order in the strong-coupling constant alpha_s and the relative velocity v of the bound quarks. The transverse-momentum distributions of prompt Upsilon(nS)-meson production measured at the Tevatron are fitted to obtain the non-perturbative long-distance matrix elements for different choices of un-integrated gluon distribution functions of the proton. 
B.A. Kniehl, V.A. Saleev, D.V. Vasin