164 research outputs found
Chiral-Odd Structure Function h_1^D(x) and Tensor Charge of the Deuteron
The chiral-odd structure function h_{1}^D(x) and the tensor charge of the
deuteron are studied within the Bethe-Salpeter formalism for the deuteron
amplitude. Utilizing a simple model for the nucleon structure function, h_1^N,
h_1^D(x) is calculated and the nuclear effects are analyzed.Comment: 10 pages, plus 3 Postscript figure
The Neutron Spin Structure Function from the Deuteron Data in the Resonance Region
Nuclear effects in the spin-dependent structure function of the
deuteron are studied in the kinematics of future experiments at CEBAF, (). The magnitude of nuclear effects is found to
be significantly larger than the one occurring in deep inelastic scattering
(). A possibility to measure the neutron
structure functions in the CEBAF experiments with deuterium is analysed. It is
found that disregarding or improperly treating nuclear effects in the region of
nucleon resonances would lead to the ``extraction" of an unreliable function. A
procedure aimed at correctly extracting the neutron structure function from the
deuterium data is illustrated and conclusions about the experimental study of
the dependence of the Gerasimov-Drell-Hearn Sum Rule for the neutron are
drawn.Comment: 11 pages, 4 Postscript figure
Parametrization of Realistic Bethe-Salpeter Amplitude for the Deuteron
The parametrization of the realistic Bethe-Salpeter amplitude for the
deuteron is given. Eight components of the amplitude in the Euclidean space are
presented as an analytical fit to the numerical solution of the Bethe-Salpeter
equation in the ladder approximation. An applicability of the parametrization
to the observables of the deuteron is briefly discussed.Comment: LaTeX, 11 pages, 2 Postscript figures; Text of the Fortran program is
available from the author by reques
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
Relativistic Description of Exclusive Deuteron Breakup Reactions
The exclusive deuteron break-up reaction is analyzed within a covariant
approach based on the Bethe-Salpeter equation with realistic meson-exchange
interaction. Relativistic effects in the cross section, tensor analyzing power
and polarization transfer are investigated in explicit form. Results of
numerical calculations are presented for kinematical conditions in forthcoming
p + D reactions at COSY.Comment: 10 LaTeX pages, 4 eps-figure
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
The Deuteron Spin Structure Functions in the Bethe-Salpeter Approach and the Extraction of the Neutron Structure Function
The nuclear effects in the spin-dependent structure functions and
are calculated in the relativistic approach based on the Bethe-Salpeter
equation with a realistic meson-exchange potential.
The results of calculations are compared with the non-relativistic
calculations. The problem of extraction of the neutron spin structure function,
, from the deuteron data is discussed.Comment: (Talk given at the SPIN'94 International Symposium, September 15-22,
1994, Bloomington, Indiana), 6 pages, 5 figures, Preprint Alberta Thy 29-9
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