Parton transverse momenta and Drell-Yan dilepton production

Abstract

The differential cross section for the dilepton production is calculated including Fermi motion of hadron constituents as well as emission from the ladders in the formalism of unintegrated parton distributions. We use unintegrated parton distributions which fulfil Kwieciński evolution equations. Both zeroth- and first-order (for matrix element) contributions are included. We calculate azimuthal angular correlations between charged leptons and deviations from the $p_t(l^{+})=p_t(l^{-})$ relation. We concentrate on the distribution in dilepton-pair transverse momentum. We find incident energy and virtuality dependence of the distribution in transverse momentum of the lepton pair. We study also azimuthal correlations between jet and dilepton pair and correlation in the $(p_{1t}(jet),p_{2t}(l^{+}{l}^{-}))$ space. The results are compared with experimental data of the R209 and UA1 collaborations.

23 pages, 18 figures, slightly modified, a comment to b-space resummation added

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• Low mass Drell-Yan production of lepton pairs at forward directions at the LHC: a hybrid approach
• Kinematical correlations of dielectrons from semileptonic decays of heavy mesons and Drell-Yan processes at BNL RHIC
• The analysis of Drell-Yan lepton pair production in the P-P(P) colliders using different angular ordering constraints and $k_t$-factorization approach
• Drell-Yan production with the CCFM-K evolution
• Infrared gluons, intrinsic transverse momentum and rising total cross-sections