731 research outputs found
Slow proton production in semi-inclusive DIS off nuclei: the role of final state interaction
The effects of the final state interaction on the production of slow protons
in semi-inclusive deep-inelastic lepton scattering off nuclei is considered
within the spectator mechanism and a realistic approach in which the
rescattering in the medium of both the recoiling proton and the hadronizing
nucleon debris are taken into account.Comment: 4 pages, 4 figures, to appear in the Proceedings of the "Fifth
International Conference on Perspectives in Hadronic Physics" held at ICTP,
Trieste, 22 - 26 May 200
Nucleon-Nucleon Correlations and Gribov Inelastic Shadowing in High Energy Collisions
The effects of nucleon-nucleon (NN) short range correlations (SRC) and Gribov
inelastic shadowing (IS) in high energy collisions are illustrated.Comment: 4 pages, 2 figures. Talk given at DIFFRACTION 2010, International
Workshop on Diffraction in High Energy Physics, Otranto, Italy, September
10-15, 201
Lepton Scattering off Few-Nucleon Systems at Medium and High Energies
The interpretation of recent Jlab experimental data on the exclusive process
A(e,e'p)B off few-nucleon systems are analyzed in terms of realistic nuclear
wave functions and Glauber multiple scattering theory, both in its original
form and within a generalized eikonal approximation. The relevance of the
exclusive process 4He(e,e'p)^3H for possible investigations of QCD effects is
illustrated.Comment: 6 pages, 3 figures. Plenary talk given by C. Ciofi degli Atti at the
XX European Conference "Few Body Problems in Physics", Pisa, Italy, September
2007. To appear in Few-Body System
On the Extraction of the Neutron Spin Structure Functions and the Gerasimov -- Drell -- Hearn Integral from data
Nuclear effects in polarized inelastic electron scattering off polarized
are discussed; in the kinematics of future experiments at CEBAF, Fermi
motion effects are found to be much larger than in deep inelastic scattering.
It is shown that improperly describing nuclear dynamics would lead to the
extraction of unreliable neutron spin structure functions. On the other hand
side, a simple and workable equation relating the Gerasimov -- Drell -- Hearn
Integral for the neutron to the corresponding quantity for is proposed.Comment: 13 pages Latex including 3 postscript figure
Nucleon-Nucleon Correlations and Six-Quark Cluster Effects in Semi-Inclusive Deep Inelastic Lepton Scattering off Few-Nucleon Systems
Semi-inclusive deep inelastic lepton scattering off few-nucleon systems is
investigated assuming that virtual boson absorption occurs on a hadronic
cluster which can be either a two-nucleon correlated pair or a six-quark bag.
In both cases the relevance of nuclear effects on forward and backward nucleon
emissions is illustrated and the differences expected in the energy
distribution of the emitted nucleons are analyzed both at x>1 and x<1.Comment: 17 pages, preprint INFN-ISS 94/8, September 1994. To appear in
Few-Body Systems. 8 figures available by fax upon request at
[email protected]
Investigation of the Neutron Form Factors by Inclusive Quasi-Elastic Scattering of Polarized Electrons off Polarized He: A Theoretical Overview
The theory of quasi-elastic inclusive scattering of polarized leptons off
polarized He is critically reviewed and the origin of different expressions
for the polarized nuclear response function appearing in the literature is
explained. The sensitivity of the longitudinal asymmetry upon the neutron form
factors is thoroughly investigated and the role played by the polarization
angle for minimizing the proton contribution is illustrated.Comment: Phys. Rev C in press; 9 figs. (available upon request
Final state interaction in semi-inclusive DIS off nuclei
The final state interaction in DIS of leptons off a nucleus A, due to the
propagation of the struck nucleon debris and its hadronization in the nuclear
environment is considered. The effective cross section of such a partonic
system with the nucleons of the medium and its time dependence are estimated on
the basis of a model which takes into account the production of hadrons due to
the breaking of the color string and to gluon radiation. It is shown that the
details of the propagation of the partonic system in the nuclear environment
can be thoroughly investigated by the semi-inclusive process A(e,e'(A-1))X, in
which the scattered lepton is detected in coincidence with the nucleus (A-1) in
low energy and momentum states. The rescattering of the struck nucleon debris
with the medium damps and distorts the momentum distributions of (A-1) in a way
which is very sensitive to the details of effective cross section of the
debris.
The total cross section of the process on ^4He, ^16O, and ^40Ca, related to
the probability that after a target nucleon experiences a DIS process, the
recoiling (A-1) nucleus remains intact, is evaluated, and the distorted
momentum distribution of the recoiling (A-1) system is obtained. It is shown
that both quantities are very sensitive to the details of the early stage of
hadronization of the nucleon debris in the nuclear medium.Comment: 27 pages, 10 eps-figure
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