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

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.