126120440
Spectra Particles From $\Lambda_c^+$ and $\Sigma_c^{++}$ Charmed Baryon Decays Produced in Neutrino $N$ Interactions
182432079
SPECTRALITY OF GELL-MANN-LOW FUNCTION
117569877
Lepton-nucleon scattering in the relativistic oscillator model
The scattering of charged leptons by a system of three quarks locked in by a relativistic oscillator potential is considered. The calculations are performed in the rest frame of the target, which allows the derivation of the explicit x and Q/sup 2/ dependences of the nucleon structure functions F/sub 1/(x,Q/sup 2/) and F/sub 2/(x,Q/sup 2/) and the quantity R = sigma/sub L//sigma/sub T/ in the region of moderate Q/sup 2/ values.
118014393
QCD analysis of deep inelastic lepton-scattering data
We have carried out a QCD analysis of data on deep inelastic lepton-scattering (using data of the collaborations BCDMS, EMC, and CDHS) in the leading and next-to-leading orders in the coupling constant ..cap alpha../sub s/. We have considered the effect of the sea quarks and gluons. We discuss the dependence of our results for ..lambda.. on effects of twist corrections, nuclear target effects, and heavy-quark production thresholds.
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.
117509698
QCD NUCLEON MODEL WITH RELATIVISTIC OSCILLATOR INTERACTION BETWEEN CONSTITUENT QUARK
119251075
Alternative Scenarios of Relativistic Heavy-Ion Collisions: I. Baryon Stopping
Simulations of relativistic heavy-ion collisions within the three-fluid model employing a purely hadronic equation of state (EoS) and two versions of the EoS involving deconfinement transition are presented. The latter are an EoS with the first-order phase transition and that with a smooth crossover transition. The model setup is described in detail. The analysis is performed in a wide range of incident energies 2.7 GeV $< \sqrt{s_{NN}} <$ 39 GeV in terms of the center-of-mass energy. Results on proton and net-proton rapidity distributions are reported. Comparison with available data indicate certain preference of the crossover EoS. It is found that predictions within deconfinement-transition scenarios exhibit a "peak-dip-peak-dip" irregularity in the incident energy dependence of the form of the net-proton rapidity distributions in central collisions. This irregularity is a signal of deconfinement onset occurring in the hot and dense stage of the nuclear collision.
119351822
Equation of state of deconfined matter within a dynamical quasiparticle description
A simple quasiparticle model, motivated by lowest-order perturbative QCD, is proposed. It is applied to interpret the lattice QCD equation of state. A reasonable reproduction of the lattice data is obtained. In contrast to existing quasiparticle models, the present model is formulated in dynamical rather than thermodynamical terms, and is easily applicable to a system with finite baryon density. In particular, the model simulates the confinement property.
7893058
Exact Conservation Laws of the Gradient Expanded Kadanoff–Baym Equations
It is shown that the Kadanoff-Baym equations at consistent first-order gradient approximation reveal exact rather than approximate conservation laws related to global symmetries of the system. The conserved currents and energy‐momentum tensor coincide with corresponding Noether quantities in the local approximation. These exact conservations are valid, provided a 8 derivable approximation is used to describe the system, and possible memory effects in the collision term are also consistently evaluated up to first-order gradients. C ∞ 2001 Academic Press
118457112
Transverse-Mass Spectra in Heavy-Ion Collisions at energies E(lab) = 2-160-GeV/nucleon
Transverse-mass spectra of protons, pions, and kaons produced in collisions of heavy nuclei are analyzed within the model of three-fluid dynamics. It was demonstrated that this model consistently reproduces these spectra in wide ranges of incident energies, 4A GeV < or approx. E{sub lab} < or approx.160A GeV, rapidity bins, and centralities of the collisions. In particular, the model describes the 'step-like' dependence of kaon inverse slopes on the incident energy. The key point of this explanation is interplay of hydrodynamic expansion of the system with its dynamical freeze-out.
119797569
Collective flow of pions in relativistic heavy-ion collisions
Abstract 3he transverse-momentum distributions of pions in the Au(1 GeV/nucleon) + Au collisions are analyzed. The calculations are carried out within relativistic mean-field one- and two-fluid models. The rapidity distributions of the mean transverse momentum of pions are found to be fairly sensitive to the nuclear equation of state and, especially, to the stopping power. It is shown that the collective flow of pions in the reaction plane always correlates with the “hot” flow of nucleons (i.e. those emitted from hot regions of nuclear system), while not always with the total nucleon flow. This “hot” nucleon flow can be experimentally singled out by selecting nucleons with sufficiently high transverse momenta. We predict that the “hot” nucleon flow selected in this way will always correlate with the pion flow. Available experimental data on transverse-momentum spectra of pions are compared with calculations employing various equations of state and stopping power.