We study the transverse single-spin asymmetry (TSSA) in p↑p → J/ψX reaction, incorporating both transverse momentum and spin effects. To predict production cross section of prompt J/ψ, we use two ...different approaches, the color-singlet model and the improved color evaporation model, and show how the predicted results for TSSAs depend on the choice of hadronization model. For initial-state factorization, we also consider two options: the standard generalized parton model and the color gauge-invariant version of it. Estimates for the TSSAs in p↑p → J/ψX process for the conditions of the future Spin Physics Detector Nuclotron-based Ion Collider fAcility (NICA) experiment are presented for the first time.
Transverse single-spin asymmetries in the production of direct photons at the Nuclotron-based Ion Collider fAcility (NICA) are studied within the generalized parton model and its color ...gauge-invariant extension. Predictions for the possible asymmetry values at various NICA energies are presented. A kinematical region where the contribution of the gluon Sivers function to the asymmetry in question is dominant over the quark Sivers function is found.
The production of D mesons in proton-proton collisions at the LHCb detector is studied. We consider the single production of D0/D¯0, D±, D*±, and Ds± mesons and correlation spectra in the production ...of DD¯ and DD pairs at the S=7 TeV and S=13 TeV. In case of the single D-meson production we calculate differential cross sections over transverse momentum pT while in the pair DD¯, DD-meson production the cross sections are calculated over the azimuthal angle difference Δφ, rapidity difference Δy, invariant mass of the pair M and over the pT of the one meson from a pair. The cross sections are obtained at the leading order of the parton Reggeization approach using Kimber-Martin-Ryskin unintegrated parton distribution functions in a proton. To describe the D-meson production we use universal scale-dependent c-quark and gluon fragmentation functions fitted to e+e− annihilation data from CERN LEP1. Our predictions find a good agreement with the LHCb Collaboration data within uncertainties and without free parameters.
We study inclusive dijet azimuthal decorrelations in proton-proton collisions at the CERN LHC invoking the hypothesis of parton Reggeization in t-channel exchanges at high energies. In the parton ...Reggeization approach, the main contribution to the azimuthal angle difference between the two most energetic jets is due to the Reggeon-Reggeon-particle-particle scattering, when the fusion of two Reggeized gluons into a pair of Yang-Mills gluons dominates. Using a high-energy factorization scheme with the Kimber-Martin-Ryskin unintegrated parton distribution functions and the Fadin-Lipatov effective vertices we obtain good agreement of our calculations with recent measurements by the ATLAS and CMS Collaborations at the CERN LHC.
The hadroproduction of the radially excited heavy-quarkonium states ψ(2S) and ϒ(3S) at high energies is studied in the parton Reggeization approach and the factorization formalism of nonrelativistic ...QCD at lowest order in the strong-coupling constant αs and the relative heavy-quark velocity v. A satisfactory description of the ψ(2S) transverse-momentum (pT) distributions measured by ATLAS, CMS, and LHCb at center-of-mass energy S=7 TeV is obtained using the color-octet long-distance matrix elements (LDMEs) extracted from CDF data at S=1.96 TeV. The importance of the fragmentation mechanism and the scale evolution of the fragmentation functions in the upper pT range, beyond 30 GeV, is demonstrated. The ϒ(3S) pT distributions measured by CDF at S=1.8 TeV and by LHCb at S=7 TeV and forward rapidities are well described using LDMEs fitted to ATLAS data at S=7 TeV. Comparisons of polarization measurements by CDF and CMS at large pT values with our predictions consolidate the familiar problem in the ψ(2S) case, but yield reasonable agreement in the ϒ(3S) case.
The production of
bosons in proton–proton collisions and the LHC energies is studied. The production cross sections for
bosons and their transverse-momentum spectra are calculated along with the ...lepton angular coefficients as functions of the
-boson transverse momentum. The calculations are performed within the parton Reggeization approach in the leading-order approximation in the strong coupling constant
and with allowance for the next-to-leading-order correction associated with Reggeized-quark scattering on a Reggeized gluon
. A numerical simulation is performed by means of the KaTie Monte Carlo generator. The results of the calculations are compared with experimental data of the ATLAS Collaboration.
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