Polarization of Y(nS) at the Fermilab Tevatron - art. no. 071501

The polarization of inclusive Y(nS) at the Fermilab Tevatron is calculated within the nonrelativistic QCD factorization framework. We use a recent det ermination of the NRQCD matrix elements from fitting the CDF data on bottom onium production from run IB of the Tevatron. The result for the polarizati on of Y(1S) integrated over the transverse momentum bin 8<(pT)<20 GeV is co nsistent with a recent measurement by the CDF Collaboration. The transverse polarization of Y(IS) is predicted to increase steadily for p(T) greater t han about 10 GeV. The Y(2S) and Y(3S) are predicted to have significantly l arger transverse polarizations than Y(1S).