Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data

TL;DR

This paper presents a comprehensive next-to-leading order QCD analysis of polarized deep inelastic scattering data, incorporating target mass and higher twist corrections, and evaluates the impact of semi-inclusive data on polarized PDFs.

Contribution

It introduces a combined analysis including semi-inclusive data and higher twist effects, improving the determination of polarized parton distribution functions.

Findings

Inclusion of semi-inclusive data refines polarized PDFs.

Target mass and higher twist corrections significantly affect results.

New PDFs are consistent with previous global analyses.

Abstract

A new combined next to leading order QCD analysis of the polarized inclusive and semi-inclusive deep inelastic lepton-hadron scattering (DIS) data is presented. In contrast to previous combined analyses, the $1/Q^2$ terms (kinematic - target mass corrections, and dynamic - higher twist corrections) in the expression for the nucleon spin structure function $g_1$ are taken into account. The new COMPASS data are included in the analysis. The impact of the semi-inclusive data on the polarized parton densities (PDFs) and on the higher twist corrections is discussed. The new results for the PDFs are compared to our (Leader, Sidorov, Stamenov) LSS'06 PDFs, obtained from the fit to the inclusive DIS data alone, and to those obtained from the de Florian, Sassot, Stratmann, and Vogelsang global analysis.