Analyzing Power in the Reaction p + p └ → π 0 + X in the polarized-target fragmentation region at an energy of 50 GeV

The results obtained by measuring, at the U-70 accelerator in Protvino, the single-spin asymmetry A N in the reaction p + p └ → π 0 + X at a beam energy of 50 GeV in the Feynman variable range of −0.6 < x F < −0.1 are presented. The asymmetry A N is close to zero at small | x F | and grows in magnitude with | x F |, reaching 6.4% in the region of | x F | > 0.25. The results of these measurements agree with data of the E704 experiment on the asymmetry of π 0 mesons at the Fermi National Accelerator Laboratory in the region of polarized-beam fragmentation and with the results of measurements in the region of polarized-target fragmentation that were performed in Protvino by using a 40-GeV π − -meson beam and a 70-GeV proton beam.