Résumé du preprint DAPNIA-04-399

DAPNIA-04-399
Relativistically invariant analysis of polarization effects in exclusive deuteron electrodisintegration process
G.I. Gakh, A.P. Rekalo, E. Tomasi-Gustafsson
A general formalism for the calculation of the differential cross 
section and  polarization observables, for the process of deuteron 
electrodisintegration, is developed in the framework of relativistic impulse approximation. 
A detailed analysis of the general structure of the differential cross section 
and polarization observables for the $e^-+d\\rightarrow e^-+n+p$ reaction 
is derived, using the formalism of the structure functions. The obtained expressions 
have a general nature and they hold in the one--photon--exchange 
mechanism, assuming P--invariance of the hadron electromagnetic interaction. 
The model of relativistic impulse approximation is introduced and 
the final state interaction is taken into account by means of the unitarization 
of the helicity amplitudes. A detailed description of the unitarization 
procedure is also presented. 

Using different parametrizations of the deuteron wave functions, the following polarization observables are calculated in the kinematical region of quasi--elastic deuteron electrodisintegration: the asymmetry for the 
scattering of longitudinally polarized electrons on a polarized deuteron target, the proton and neutron 
polarizations (for longitudinally polarized electron beam or vector--polarized 
deuteron target). The sensitivity to the neutron electric form factor  
is also thorougly investigated.

The predictions of the model are compared with the results of recent 
polarization measurements and a good agreement with the existing experimental 
data has been obtained.

 

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