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 p (p) over bar 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 Y(1S), Y(2S), and Y(3S) at large p(T) and the fractions of Y(1S) coming from chi (b)(1P) and chi (b)(2P). We use the resulting matrix elements to predict the cross sections at the Tevatron for the spin-singlet states eta (b)(nS) and h(b)(nP). We argue that eta (b)(1S) may be observable in run II through the decay eta (b)-->J/psi +J/psi.