Role of Positivity Constraints in Determining Polarized Parton Densities

Details Role of Positivity Constraints in Determining Polarized Parton Densities Role of Positivity Constraints in Determining Polarized Parton Densities

2005-03-15

arxiv.org/abs/hep-ph/0503140v2

JHEP 0506:033,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1088/1126-6708/2005/06/033

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.

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