The amplitude for photoproduction γp → Υp is calculated in a pQCD k ⊥ -factorization approach. The total cross section for diffractive Υs is compared to recent HERA data. The amplitude is used to predict the cross section for exclusive pp → pΥ(1S, 2S)p proces in hadronic reactions at Tevatron energies. We also included absorption effects.
We compare results of k t -factorization approach and next-to-leading order collinear-factorization approach for dijet correlations in proton-proton collisions at RHIC energies. We discuss correlations in azimuthal angle as well as correlations in two-dimensional space of transverse momenta of two jets. Some k t -factorization subprocesses are included for the first time in the literature. Different unintegrated gluon/parton distributions are used in the k t -factorization approach. The results depend on UGDF/UPDF used. For collinear NLO case the situation depends significantly on whether we consider correlations of any two jets or correlations of leading jets only. In the first case the 2 → 2 contributions associated with soft radiations summed up in the k t -factorization approach dominate at φ ∼ π and at equal moduli of jet transverse momenta. The collinear NLO 2 → 3 contributions dominate over k t -factorization cross section at small relative azimuthal angles as well as for asymmetric transverse momentum configurations. In the second case the NLO contributions vanish at small relative azimuthal angles and/or large jet transverse-momentum disbalance due to simple kinematical constraints. There are no such limitations for the k t -factorization approach. All this makes the two approaches rather complementary. The role of several cuts is discussed and quantified.
The amplitude for photoproduction γp → ϒp is calculated in a pQCD k⊥-factorization approach. The total cross section for diffractive ϒ s is compared to recent HERA data. The amplitude is used to predict the cross section for exclusive [Formula: see text] proces in hadronic reactions at Tevatron energies. We also included absorption effects.
We report on a detailed investigation of exclusive J/ψ production in proton–proton and proton–antiproton collisions. Predictions for Tevatron and LHC energies are included.
Abstract. We discuss correlations in azimuthal angle as well as correlations in twodimensional space of transverse momenta of two jets as well as photon and jet. Some kt-factorization subprocesses are included for the first time in the literature. Different unintegrated gluon/parton distributions are used in the kt-factorization approach. The results depend on UGDF/UPDF used. The collinear NLO 2 → 3 contributions dominate over kt-factorization cross section at small relative azimuthal angles as well as for asymmetric transverse momentum configurations.
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