Single spin asymmetries in inclusive $\pi^0$ production in $p+p$ and $\pi^-+p$ interactions at 40-70 GeV

Abstract

We present recent results of single-spin asymmetry $A_N$ measurements in $\pi^0$ inclusive production. Asymmetry was measured in $\pi^-p$ and $pp$ interactions at 40 and 70 GeV correspondingly. Significant asymmetry was observed in the polarized target fragmentation region. The results are in agreement with "universal threshold" of single-spin asymmetry.