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

TL;DR

This paper reports measurements of single-spin asymmetries in inclusive π^0 production during proton-proton and π^-+p interactions at energies of 40 and 70 GeV, revealing significant asymmetries in specific regions.

Contribution

It provides new experimental data on single-spin asymmetries in π^0 production at intermediate energies, supporting the concept of a universal threshold for such asymmetries.

Findings

Significant asymmetry observed in polarized target fragmentation region.

Results support the 'universal threshold' hypothesis for single-spin asymmetries.

Asymmetries measured are consistent across different interaction types and energies.

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.