Next-to-Leading Order Differential Cross Sections for J/psi, psi (2S), and Upsilon Production in Proton-Proton Collisions at a Fixed-Target Experiment Using the LHC Beams

摘要

Using nonrelativistic QCD (NRQCD) factorization, we calculate the yields for J/psi, psi (2S), and Upsilon(1S) hadroproduction at root s = 72GeV and 115GeV including the next-to-leading order QCD corrections. Both these center-of-mass energies correspond to those obtained with 7 TeV and 2.76 TeV nucleon beam impinging a fixed target. We study the cross section integrated in p(t) as a function of the (center-of-mass) rapidity as well as the p(t) differential cross section in the central rapidity region. Using different NLO fit results of the NRQCD long-distance matrix elements, we evaluate a theoretical uncertainty which is certainlymuch larger than the projected experimental uncertainties with the expected 20fb(-1) to be collected per year with AFTER@LHC for pp collision at the center of mass energy root s similar or equal to 115 GeV.