Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-04-24
Phys.Rev.D80:034030,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 15 eps figures, v2: minor changes, final version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.80.034030
We discuss techniques and results for the extraction of the nucleon's spin-dependent parton distributions and their uncertainties from data for polarized deep-inelastic lepton-nucleon and proton-proton scattering by means of a global QCD analysis. Computational methods are described that significantly increase the speed of the required calculations to a level that allows to perform the full analysis consistently at next-to-leading order accuracy. We examine how the various data sets help to constrain different aspects of the quark, anti-quark, and gluon helicity distributions. Uncertainty estimates are performed using both the Lagrange multiplier and the Hessian approaches. We use the extracted parton distribution functions and their estimated uncertainties to predict spin asymmetries for high-transverse momentum pion and jet production in polarized proton-proton collisions at 500 GeV center-of-mass system energy at BNL-RHIC, as well as for W boson production.
de Florian Daniel
Sassot Rodolfo
Stratmann Marco
Vogelsang Werner
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