1,964 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 Final State Interaction in Inclusive Quasi-Elastic Electron Scattering off Nuclei at x>1
Inclusive quasi-elastic electron scattering off nuclei is investigated at
high momentum transfer (Q^2>1 (GeV/c)^2) and x>1 adopting a consistent
treatment of nucleon-nucleon correlations in initial and final states. It is
shown that in case of light as well as complex nuclei the inclusive cross
section at 1.3<x<2 is dominated by the absorption of the virtual photon on a
pair of correlated nucleons and by their elastic rescattering in the continuum,
whereas at x>2 it is governed by the rescattering of the outgoing
off-mass-shell nucleon in the complex optical potential generated by the ground
state of the residual (A-1)-nucleon system.Comment: 06100 Perugia, Italy (b) Istituto Nazionale di Fisica Nucleare,
Sezione Sanita', Viale Regina Elena 299, I-00161 Roma, Italy 8 pages,
preprint INFN-ISS 94/1, January 1994 (to appear in Phys. Lett. B
Hadronization and final state interaction effects in semi-exclusive Deep Inelastic Scattering off nuclei
Recent calculations of the effects of hadronization and final state
interaction (FSI) in semi-exclusive deep-inelastic scattering (DIS)
processes are reviewed. The basic ingredient underlying these
calculations, {\it viz} the time-dependent effective debris-nucleon cross
section is illustrated, and some relevant results on complex nuclei and the
deuteron are presented. In the latter case, particular attention is paid to the
choice of the kinematics, for such a choice would in principle allow one to
investigate both the structure function of a bound nucleon as well as the
hadronization mechanisms. It is stressed that a planned experiment at Jlab on
the process could be very useful in that respect.Comment: 6 pages, 5 EPS figures. Presented by C. Ciofi degli Atti at the
Fourth International Conference on Hadronic Physics, Trieste (Italy), ICTP
May 12-16, 2003. To appear in EPJ
Final state interaction effects in semi-inclusive DIS off the deuteron
The effects of the final state interaction (FSI) in semi-exclusive
deep-inelastic scattering of electrons off the deuteron are analyzed paying
particular attention to two extreme kinematical regions: i) the one where FSI
effects are minimized, so that the quark distribution of bound nucleons could
be investigated, and ii) the one where the re-interaction of the produced
hadrons with the spectator nucleon is maximized, which would allow one to study
the mechanism of hadronization of highly virtual quark. It is demonstrated that
when the recoiling spectator nucleon is detected in the backward hemisphere
with low momentum the effects from FSI are negligible, whereas at large
transverse momenta of the spectator the FSI effects are rather large. Numerical
estimates show that the FSI corrections are sensitive to the theoretical models
of the hadronization mechanism.Comment: 18 pages 6 figures A draft of the paper was erroneously sent instead
of the paper itsel
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 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
A New Approach to y-scaling and the Universal Features of Scaling Functions and Nucleon Momentum Distributions
Some systematic general features of y-scaling structure functions, which are
essentially independent of detailed dynamics, are pointed out. Their physical
interpretation in terms of general characteristics, such as a mean field
description and nucleon-nucleon correlations, is given and their relationship
to the momentum distributions illustrated. A new relativistic scaling variable
is proposed which incorporates the momentum dependence of the excitation energy
of the (A-1) system, with the resulting scaling function being closely related
to the longitudinal momemtum distributions and being free from removal-energy
scaling violating effects.Comment: 17 pages, RevTeX, 4 ps Figures, to appear in Physics Letters
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