DeuteronPwave in elastic backward proton-deuteron scattering

Abstract

The elastic backward proton-deuteron scattering is analyzed within a covariant approach based on the invariant expansion of the reaction amplitude. The relativistic invariant equations for all the polarization observables are presented. Within the impulse approximation the relation of the tensor analyzing power T 20 and the polarization transfer 0 to the P-wave components of the deuteron wave function is found. Comparison of the theoretical calculations with the experimental data is presented. Experimental verification of the reaction mechanism by constructing some combinations of different observables is suggested.

Relativistic and spin effects in elastic backward p-d scattering

“…(W p ) is too small, it is less than 1%. Recently it has been shown [13] that within the relativistic one-nucleon exchange model (RONE) proposed in [20] one can not describe all the polarization experimental data for the elastic backward p − d scattering even by increasing the parameter W p till several percent.…”

“…On the other hand, the amplitude corresponding to the one-nucleon exchange Feynman graph (Fig. 1a) can be presented in the following form [4,13,[28][29][30]:…”

“…are the four-momenta of neutron and proton in the deuteron. Unfortunately, the ONE and the RONE do not allow a satisfactory description of all the observables at the kinetic energy of backward scattered protons T p > 0.6 GeV [13].…”

“…Usually these processes are analyzed within a simple impulse approximation. Up to now all these data have not been described within the one-nucleon exchange model (ONE) including even the relativistic effects in the deuteron [12,13]. In this paper we analyze the elastic backward proton-deuteron scattering within the relativistic approach including the ONE and the high order graphs corresponding to the emission, rescattering and absorption of the virtual pion by a nucleon of deuteron [14].…”