Nonrelativistic QCD analysis of bottomonium production at the Fermilab Tevatron

Recent data from the CDF Collaboration on the production of spin-triplet bottomonium states at the Fermilab Tevatron pp̅ collider are analyzed within the NRQCD factorization formalism. The color-singlet matrix elements are determined from electromagnetic decays and from potential models. The color-octet matrix elements are determined by fitting the CDF data on the cross sections for Υ(1S), Υ(2S), and Υ(3S) at large p_T and the fractions of Υ(1S) coming from χ_b(1P) and χ_b(2P). We use the resulting matrix elements to predict the cross sections at the Tevatron for the spin-singlet states η_b(nS) and h_b(nP). We argue that η_b(1S) may be observable in run II through the decay η_b→J/ψ+J/ψ.