82 research outputs found
Hadron Multiplicity in Lepton-Nucleon Interactions
Multi-hadron production in inelastic neutrino-nucleon interactions is
investigated within the framework of the quark-gluon string model. The
contributions of the planar (one-Reggeon exchange) and cylindrical (one-Pomeron
exchange) graphs to different observables is computed using a Monte Carlo
program for the generation of hadrons produced from the decay of colorless
quark-antiquark strings. The suggested approach results in a satisfactory
description of the experimental data on
reactions obtained recently at CERN by the NOMAD Collaboration. The data
extends over a wide range of initial neutrino energies 200 GeV/c
and momentum transfers 1 Q 7 GeV/c, well into the region where
perturbative QCD calculations are not applicable.Comment: 10 pages, 5 figure
Hadron Multiplicity in Semi-Inclusive Lepton-Nucleon and Lepton-Nucleus Scattering
We discuss multi-hadron production in both inelastic neutrino-nucleon
interactions in the current fragmentation region and neutrino-nucleus
collisions in the target fragmentation region. Our analysis, carried out within
the framework of the quark-gluon string model, is mainly focused on the
difference between these two processes. We show that the dependence of
hadron multiplicity in the current and target fragmentation regions is indeed
completely different. The study of inelastic scattering in the target
fragmentation region also provides new information on nuclear structure at
small distances. The results of the proposed approach are in satisfactory
agreement with the data recently obtained at CERN by the NOMAD Collaboration.Comment: Talk delivered a the Fourth International Conference on Perspectives
in Hadronic Physics (ICTP, Trieste, Italy, May 2003). To be published in the
Proceedings (EPJA
Open charm and beauty production in hadron reactions
The production of charmed and beauty hadrons in proton-proton and
proton-antiproton collisions at high energies is analyzed within the modified
quark-gluon string model (QGSM) including the internal motion of quarks in
colliding hadrons. It is shown that using both the QGSM and NLO QCD one can
describe the experimental data rather successfully in a wide region of
transverse momenta. We also present some predictions for the future experiments
on the beauty baryon production in collisions at LHC energies and on the
charmed meson production in reactions at GSI energies.Comment: 8 pages, 10 figures. Talk given at International Conference on Hadron
Structure (HS 09), Tatranska Strba, Slovak Republic, August 29th-September
3rd, 200
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