117509698
QCD NUCLEON MODEL WITH RELATIVISTIC OSCILLATOR INTERACTION BETWEEN CONSTITUENT QUARK
615085
Nucleon structure as a background for determination of fundamental parameters.
We consider deep inelastic (quasi)elastic lepton-nucleon scattering and investigate the possibilities of eliminating or suppressing theoretical uncertainties induced by the nucleon structure in measuring the standard model parameters or in searching for new physics. On the basis of rather general assumptions about nucleon structure we have obtained new relations between cross sections and neutral current parameters which are weakly dependent on the nucleon structure. We also investigate the dependence of the QCD $\ensuremath{\Lambda}$ parameter extracted from the data on the unknown large-scale nucleon structure and propose a modification of the conventional QCD predictions in which the dependence on this uncertainty factor is suppressed.
116961738
Electroproduction of Charmonia off Protons and Nuclei
Elastic virtual photoproduction of charmonia on nucleons is calculated in a parameter free way with the light‐cone dipole formalism and the same input: factorization in impact parameters, light‐cone wave functions for the photons and the charmonia, and the universal phenomenological dipole cross section which is fitted to other data. The charmonium wave functions are calculated with four known realistic potentials, and two models for the dipole cross section are tested. Very good agreement with data for the cross section of charmonium electroproduction is found in a wide range of s and Q2. Using the ingredients from those calculations we calculate also exclusive electroproduction of charmonia off nuclei. Here new effects become important, (i) color filtering of the cc pair on its trajectory through nuclear matter, (ii) dependence on the finite lifetime of the cc fluctuation (coherence length) and (iii) gluon shadowing in a nucleus compared to the one in a nucleon. Total coherent and incoherent cross sec...
115685349
TWO PARTICLE LEPTON - NUCLEON PROCESSES IN DUAL QCD APPROACH
126039083
Approximated Solution of {QCD} Evolution Equations
118188860
Vector meson production in ultra-peripheral collisions at LHC
Vector meson production in ultra-peripheral collisions of heavy ions at LHC is calculated in VDM and color dipole approaches.
116146206
Multifluid dynamics of intermediate-energy heavy-ion collisions
An extension of the multifluid approach to the description of heavy-ion collisions is proposed. A three-fluid model involving mean {sigma} and {omega} fields is formulated for heavy-ion collisions at incident energies around 1 GeV per nucleon. It is a natural extension of a similar two-fluid model developed in our recent papers and is intended to obtain a closer approximation to the complete relativistic mean-field kinetic theory. The collisional coupling between the fluids is formulated in terms of hadron-hadron cross sections (which take into account Pauli blocking). The model contains no fitting parameters. The relativistic mean-field three-fluid model (RMF-3FM) is tested for the case of thermalization in counter-streaming nuclear fluids. Comparison with the results obtained in relativistic Landau-Vlasov kinetics and in a similar two-fluid model (RMF-2FM) shows that the RMF-3FM reproduces the gross properties of the equilibration better than the RW-2FM. 30 refs., 6 figs.
116272686
Dynamical Instabilities in Relativistic Heavy-Ion Collisions and Associated Phenomena
17968257
Gapless Hartree-Fock resummation scheme for the O(N) model
A modified self-consistent Hartree-Fock approximation to the {lambda}{phi}{sup 4} theory with spontaneously broken O(N) symmetry is proposed. It preserves all the desirable features, like conservation laws and thermodynamic consistency, of the self-consistent Schwinger-Dyson scheme generated from a 2PI functional, also known as the {phi}-derivable scheme, while simultaneously respecting the Nambu-Goldstone theorem in the chiral-symmetry broken phase. Various approximate resummation schemes are discussed.
120525462
Stochastic multi-fluid models for intermediate-energy heavy-ion collisions☆
Abstract The relativistic Boltzmann-Langevin equation is reduced to a stochastic multi-fluid model and the corresponding transport coefficients, i.e. the interflow friction force and the interflow diffusion tensor, are extracted. The model is applied to fluctuation phenomena in the equilibration process for two counter-streaming nuclear fluids.
120370576
Extended transverse-momentum analysis for intermediate-energy heavy-ion collisions
Abstract An extension of the transverse-momentum analysis of Danielewicz and Odyniec is proposed. This extension involves a consideration of baryonic p T -distribution widths in and out of the reaction plane. Calculations within one- and two-fluid mean-field models show that such an analysis allows us to extract more information on the nuclear equation of state and stopping power than the conventional one does. Different criteria for selecting collision events (i.e. sorting them out according to impact parameters) are also examined. Selections according to the baryonic multiplicity in the midrapidity region and the transversal-to-longitudinal energy ratio are found to be suitable for this purpose.