Polarized deuteron charge-exchange reaction $dp->{pp}_{s}N\ddot{I}€$ in the Delta-isobar region

Abstract

Mechanisms of the charge exchange reaction $dp\to \{pp{\}}_{s}N\ddot{I}€$, where $\{pp{\}}_s$ is a two-proton system at low excitation energy, are studied at beam energies 1 -- 2 GeV and for invariant masses $M_X$ of the final $N\ddot{I}€$ system that correspond to the formation of the $\hat{I}”(1232)$ isobar. The direct mechanism, where the initial proton is excited into the $\hat{I}”(1232)$, dominates and explains the existing data on the unpolarized differential cross section and spherical tensor analyzing power $T_{22}$ for $M_X>1.2$ GeV/$c^2$. However, this model fails to describe $T_{20}.

6 pages, 3 figures; talk given at Baldin ISHEPP XXII