365 research outputs found
Rescattering and finite formation time effects in electro-disintegration of the deuteron in the cumulative region
The role of rescattering due to the final state interaction (FSI) and the
influence of the finite formation time (FFT) on the inclusive and
exclusive electro-disintegration of the deuteron are studied in the
cumulative kinematical region and moderate values of the 4-momentum
transfer (GeV/c). The spins are averaged out. It is found
that in the inclusive process the relative magnitude of rescattering steadily
grows with and that at it has the same order as the plane wave
impulse approximation (PWIA) contribution, with the finite formation time
effects decreasing the rescattering contribution by %. In the
exclusive process, with increasing momentum transfer, FFT substantially reduces
the effects from FSI, although the latter are still appreciable in the region
of momentum transfer investigated.Comment: 5 pages, 5 EPS figures. Presented by M. A. Braun at the Fourth
International Conference on Hadronic Physics, Trieste (Italy), ICTP May
12-16, 2003. To appear in EPJ
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
Final state interaction in inclusive and exclusive quasi-elastic processes
We discuss a new approach to final state interactions, that keeps explicitly
into account the virtuality of the ejected nucleon in quasi-elastic
scattering at very large , and we present some recent results, at
moderately large values, for the nuclear transparency in ,
and and for the momentum distributions of .Comment: 10 pages, 5 figures, Prepared for the workshop "Cortona 2000, VIII
Convegno su Problemi di Fisica Nucleare Teorica
Hadron physics: a quark-model analysis
We discuss recent results on heavy and light baryon spectroscopyComment: Talk given at the 6th International Conference on Perspectives in
Hadronic Physics, Trieste, Italy, 12-16 May 200
On the effects of the final state interaction in the electro-disintegration of the deuteron at intermediate and high energies
The role of the final state interactions (FSI) in the inclusive quasi-elastic
disintegration of the deuteron is investigated treating the two-nucleon final
state within the exact continuum solutions of the non-relativistic Schroedinger
equation, as well as within the Glauber multiple scattering approach. It is
shown that for values of the Bjorken scaling variable both
approaches provide similar results, unless the case , where
they appreciably disagree. It is demonstrated that present experimental data,
which are mostly limited to a region of four-momentum transfer () where the Center-of-Mass energy of the final state is below the
pion threshold production, can be satisfactorily reproduced by the approach
based on the exact solution of the Schroedinger equation and not by the Glauber
approach. It is also pointed out that the latter, unlike the former, does not
satisfy the inelastic Coulomb sum rule, the violation being of the order of
about 20%.Comment: 16 LaTeX pages, 10 eps-figures, 1 tabl
Relativistic approaches to structure functions of nuclei
We employ a propagator technique to derive a new relativistic 1/\qq
expansion of the structure function of a nucleus, composed of point-nucleons.
We exploit non-relativistic features of low-momentum nucleons in the target and
only treat relativistically the nucleon after absorption of a high-momentum
virtual photon. The new series permits a 3-dimensional reduction of each term
and a formal summation of all Final State Interaction terms. We then show that
a relativistic structure function can be obtained from its non-relativistic
analog by a mere change of a scaling variable and an addition of an energy
shift. We compare the obtained result with an ad hoc generalized
Gersch-Rodriguez-Smith theory, previously used in computations of nuclear
structure functions.Comment: Comparison with data is included, to be published in PRC, Feb. 200
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