New Analysis of the Single Transverse-Spin Asymmetry for Hadron Production at RHIC

TL;DR

This paper provides a comprehensive analysis of single transverse-spin asymmetries in inclusive hadron production at RHIC, incorporating all relevant twist-3 pole contributions to improve theoretical descriptions.

Contribution

It introduces the inclusion of soft-fermion-pole contributions alongside soft-gluon-poles in the twist-3 mechanism, enhancing the accuracy of SSA predictions at RHIC.

Findings

Better description of SSA data for all meson types

Improved match with RHIC observations across different P_T values

Comparison with FNAL data supports the model's validity

Abstract

We analyze the single transverse-spin asymmetry (SSAs) for inclusive hadron production in the $pp$ collision at RHIC based on the twist-3 mechanism in QCD. As an origin of SSAs, we take into account of all kinds of pole contributions associated with the twist-3 quark-gluon correlation functions in the polarized proton. By the inclusion of the soft-fermion-pole contribution in addition to the soft-gluon-pole contribution, we find SSAs observed at RHIC are better described for all kinds of mesons. $P_T$-dependence of the asymmetry and the comparison with the FNAL data are also presented.