2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37632Single Spin Asymmetry $A_N$ (SSA) was measured at the Protvino 70 GeV accelerator. Asymmetry in the reaction $\ppdup$ is close to zero within error bars at small $|\xf|$ and $p_T<1.5$ GeV/c. SSA in the reaction $\pimp$ at polarized target fragmentation region equals to $(-13.8 \pm 3.8)%$ at $|x_f|>0.4$. There is an indication that the asymmetry begins to rise up at the same centre of mass system pion energy.6 pages, 5 figures; Presented on X International Workshop on High Energy Spin Physics (SPIN-03), Dubna, September 16-20High Energy Physics - Experimenttext