Global Analysis of Helicity Parton Densities and Their Uncertainties

Abstract

We present a new analysis of the helicity parton distributions of the nucleon. The analysis takes into account the available data from inclusive and semi-inclusive polarized deep inelastic scattering, as well as from polarized pp scattering at RHIC. For the first time, all theoretical calculations are performed fully at next-to-leading order (NLO) of perturbative QCD, using a method that allows to incorporate the NLO corrections in a very fast and efficient way in the analysis. We find evidence for a rather small gluon polarization in the nucleon, over a limited region of momentum fraction, and for interesting flavor patterns in the polarized sea.

4 pages, 3 figures

References in corpus (4)

• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Global Analysis of Fragmentation Functions for Protons and Charged Hadrons
• Inclusive cross section and double helicity asymmetry for π^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton
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Cited by in corpus (6)

• Towards the NNLO evolution of polarised parton distributions
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• Gaugino-pair production in polarized and unpolarized hadron collisions
• Gluon polarization and higher twist effects
• Recent PHENIX Results on pi+, pi-, and eta Production in polarized pp Collisions at RHIC at sqrt(s) = 200 GeV
• Recent Spin Results from the PHENIX Detector at RHIC