Single transverse spin asymmetries for semi-inclusive pion production in DIS

TL;DR

This paper develops a phenomenological model incorporating quark intrinsic motion to describe single transverse spin asymmetries in semi-inclusive pion production during deep inelastic scattering, extending pQCD formalism.

Contribution

It introduces a generalized pQCD approach that includes quark intrinsic motion in spin-dependent fragmentation functions for predicting STSA in SIDIS.

Findings

Predictions for STSA in semi-inclusive deep inelastic scattering.

Inclusion of quark intrinsic motion effects in fragmentation.

Extension of pQCD formalism to account for spin and k_T effects.

Abstract

We present a phenomenological approach to the description of single transverse spin asymmetries (STSA) in inclusive hadron production. It generalizes the pQCD formalism for high energies and large p_T inclusive hadron production processes, A+B -> C+X, by incorporating quark intrinsic motion in the spin dependent quark distribution and fragmentation functions. We concentrate here on spin and k_T effects in the fragmentation process of a polarized quark into the observed hadron, and give predictions for STSA in semi-inclusive deep inelastic scattering, l + p -> pion + X and gamma^* + p -> pion + X.