AN AT SMALL NEGATIVE VALUES OF xF IN THE REACTION p+p↑→π~0+X at 70GeV AND UNIVERSAL THRESHOLD IN INCLUSIVE PION PRODUCTION

摘要

This paper continues the series of Single Spin Asymmetry (SSA) n° inclusive measurements carried out at the Protvino 70 GeV accelerator. The asymmetry in the polarized target fragmentation region grows in absolute value with decreasing *F, and becomes (-16±5)% at -0.4 < xf < -0.25. The result of the current experiment is in agreement with the universal threshold in pion asymmetries.