Associated production of Γ(1S)W at LHC in next-to-leading order QCD

We investigate the complete next-to-leading order (NLO) QCD corrections to Gamma(1S) + W production at the LHC, and predict theoretically the distribution of the Gamma(1S) transverse momentum. We analyse the contributions from different components up to the QCD NLO in the pp -> Gamma(1S) + W + X process. Our results show that the pp -> Gamma(1S) + W + X process has a large production rate and could be potentially detected at the LHC. We see that the differential cross section for the Gamma(1S) direct-production at the LO is significantly enhanced by the QCD corrections, and the b (b) over bar [S-3(1)(8)] contribution component dominates in the whole plotted p(T)(Gamma(1S)) region. We have also calculated the Gamma(1S) meson indirect-productions via feed-down decays of Gamma(2S), Gamma(3S), chi(b1)(1P), chi(b2)(1P), chi(b1)(2P), and chi(b2)(2P) mesons. We find that the Gamma(1S) indirect-productions can give important contributions to the distribution of p(T)(Gamma(1S)) for the pp -> Gamma(1S) + W + X process at the NLO. We conclude that the studying the Gamma(1S) + W production at the LHC could provide an interesting opportunity in testing the nonrelativistic QCD factorization formalism.