ROLE OF TENSOR MESON POLE AND DELTA-EXCHANGE DIAGRAMS IN P(P)OVER-BAR-]PI(-)()PI()

The (N) over bar N-->pi pi annihilation reaction is investigated in a model with both baryon-exchange diagrams and meson-pole diagrams. The main features of the observed differential cross sections for (p) over bar p-->pi(+)pi(-) from 360 to 1190 MeV/c are well understood in this model. The backward enhancement of the differential cross section is mainly due to the N Delta pi tensor coupling while the process (p) ove r bar p-->f(2)-->pi(+)pi(-) contributes to the bump structure around 1 00 degrees developing for P-lab>680 MeV/c. This hints at nontrivial qu ark spin contributions beyond the P-3(0) model (which favored S and P waves) and hints at a large gluonic component in tensor mesons with ma sses between 1.27 and 2.2 GeV.