Production and polarization of prompt γ(nS) in the improved color evaporation model using the kT-factorization approach

We calculate the polarization of prompt gamma(nS) production in the improved color evaporation model at leading order employing the k(T)-factorization approach. We present the polarization parameter lambda(theta) of prompt gamma(nS) as a function of transverse momentum in p + p and p + (p) over bar collisions to compare with data in the helicity, Collins-Soper and Gottfried-Jackson frames. We also present calculations of the bottomonium production cross sections as a function of transverse momentum and rapidity. This is the first p(T)-dependent calculation of bottomonium production and polarization in the improved color evaporation model. We find agreement with both bottomonium cross sections and polarization measurements.