On the flat transverse momentum dependence of the single-spin asymmetry in inclusive neutral pion production

TL;DR

This paper analyzes recent RHIC experimental results showing a flat transverse momentum dependence of single-spin asymmetry in neutral pion production, supporting nonperturbative spin filtering mechanisms.

Contribution

It connects experimental findings with predictions of nonperturbative spin filtering models, highlighting the flat $p_T$ dependence up to 10 GeV/c.

Findings

Flat $p_T$ dependence observed up to 10 GeV/c

Supports nonperturbative spin filtering mechanism

Implications for understanding spin asymmetries in hadron interactions

Abstract

We discuss recent experimental results from RHIC where the flat transverse momentum dependence of a single-spin asymmetry has been found in inclusive production of neutral pions. This dependence takes place in a wide region of the transverse momenta up to $p_T=10$ GeV/c. We emphasize that similar dependence has been predicted in the nonperturbative spin filtering mechanism for the single-spin asymmetries in hadron interactions and present some implications for this mechanism from the new experimental data.