Spin effects at fragmentation of polarized deuterons into cumulative pions

Tensor analyzing power T20 of the reaction dA→π(0°)X was measured in the fragmentation of 9 GeV deuterons into points with the momenta from 3.5 to 5.3 GeV/c at hydrogen, beryllium and carbon targets. This momentum range corresponds to region of cumulative pion production The values of T20 are found to be small and consistent with positive values in contradiction with the Impulse Approximation calculations based on assuming a direct mechanism of pion production (NN→NNπ). New data on tensor Ayy analyzing power for pion production at the non-zero angle (θπ=135,180mr) with pion transverse momenta up to Pt=0.8 GeV/c are presented. Ayy increases with rise of Pt in the cumulative region.