101 research outputs found
Light-front versus Bethe-Salpeter forms of two nucleon amplitudes
We discuss the relation between the two nucleon Bethe-Salpeter amplitude and
the light front wave functions. Both approaches provide a covariant description
for the deuteron bound state and the two nucleon scattering state. A comparison
is done for the spin-orbit functions as well explicit integrals are given on
the basis of the Nakanishi integral representation method.Comment: 13 pages, Few Body Systems format needs fbsart11.sty, fbsedit2.st
Pion Exchange Effects in Elastic Backward Proton-Deuteron Scattering
The elastic backward proton-deuteron scattering is analyzed within a
covariant approach based on the Bethe-Salpeter equation with realistic
meson-exchange interaction. Contributions of the one-nucleon and one-pion
exchange mechanisms to the cross section and polarization observables are
investigated in explicit form. Results of numerical calculations for the cross
section, tensor analyzing power and spin transfers are presented. The one-pion
exchange contribution is essential for describing the spin averaged cross
section, while in polarization observables it is found to be less important.Comment: 19 LaTeX pages, including 5 eps figure
Exclusive charge exchange reaction pD->n(pp) within the Bethe-Salpeter formalism
The exclusive charge exchange reaction pD->n(pp) at intermediate and high
energies is studied within the Bethe-Salpeter formalism. The final state
interaction in the detected pp pair at nearly zero excitation energy is
described by the 1S0 component of the Bethe-Salpeter amplitude. Results of
numerical calculations of polarization observables and differential
cross-section persuade that, as in the non-relativistic case, this reaction (i)
can be utilized as a ``relativistic deuteron polarimeter'' and (ii) delivers
further information about the elementary nucleon-nucleon charge-exchange
amplitude.Comment: 38 pages, 10 eps-figure
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