Angle Dependence of Polarization Observables by Fragmentation of Deuterons to Pions

Abstract

The fragmentation of deuterons into pions with nonzero angle emitted in the kinematical region forbidden for free nucleon-nucleon collisions is analyzed. The inclusive relativistic invariant spectrum of pions and the tensor analyzing power ${\mathrm{A}}_{YY}$ are investigated within the framework of an impulse approximation using different kinds of the deuteron wave function. The influence of $\mathrm{P}$-wave contribution to the deuteron wave function is studied, too. Our results are compared with the experimental data and other calculations performed within both the non-relativistic and relativistic approaches. It was found that theoretical calculations based on IA do not provide a consistent understanding of the new data in a whole cumulative region that can be caused by a influence of non-nucleon degrees of freedom.

Comments: Paper contains 7 pages, 2 eps figures, 1 picture - czjphys.sty required; to be published in Proc. of the International Workshop "Symmetry and Spin", Prague-Spin2000, Prague, July 17 - 22, 2000. minor misprints corrected, slight refinement of graphics, references added (conclusions unchanged)