Role of Positivity Constraints in Determining Polarized Parton Densities

Abstract

We have re-analyzed the world data on inclusive polarized DIS, in both NLO and LO QCD, including the very precise JLab Hall A neutron data, and have studied the role of positivity constraints, and demonstrated their importance, in determining the strange and gluon densities. We have shown that higher twist corrections are essential in the analysis of the present data on the structure function g1. A consistent QCD analysis is achieved, and results for the polarized parton densities are given in both the MSbare and JET schemes.

20 pages, 10 figures, 3 tables; minor changes are made in the text, a new figure (Fig. 7) and references added, version accepted for publication in JHEP

References in corpus (6)

• Measurement of the Spin Structure of the Deuteron in the DIS Region
• Precision Measurement of the Neutron Spin Asymmetry $A_1^n$ and Spin-Flavor Decomposition in the Valence Quark Region
• Determination of polarized parton distribution functions and their uncertainties
• Global Analysis of Data on the Proton Structure Function g1 and Extraction of its Moments
• Structure Functions and Parton Distributions
• Importance of Higher Twist Corrections in Polarized DIS

Cited by in corpus (9)

• Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs
• The Spin Structure of the Nucleon
• Longitudinal Polarized Parton Densities Updated
• X(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem
• Quark-Hadron Duality in Neutron (3He) Spin Structure
• Higher twists in polarized DIS and the size of the constituent quark
• Search for solar hadronic axions produced by a bremsstrahlung-like process
• Impact of recent COMPASS data on polarized parton distributions and structure functions
• On the Relation Between x-dependence of the Higher Twist Contribution to F_3 and g_1^p - g_1^n