Leading and higher twist contributions in semi-inclusive e+e- annihilation at high energies

TL;DR

This paper develops a systematic theoretical framework using collinear expansion to calculate leading and higher twist contributions in semi-inclusive e+e- annihilation, including spin effects and azimuthal asymmetries.

Contribution

It introduces a method to compute twist-3 contributions for various hadron spins in semi-inclusive processes at high energies.

Findings

Calculated hadronic tensors and differential cross sections.

Analyzed azimuthal asymmetries and hadron polarizations.

Provided a systematic approach for twist expansion in QCD.

Abstract

By applying the collinear expansion to the semi-inclusive hadron production process $e^++e^-\to h+\bar q(jet)+X$ at high energies, we construct a theoretical framework where the leading and higher twist contributions at the leading perturbative QCD can be calculated systematically. With this framework, we calculate the contributions up to twist-3 for spin-0, spin-1/2 and spin-1 hadrons respectively. We present the results for the hadronic tensors, the differential cross sections, the azimuthal asymmetries, and the polarizations of the hadrons.