Global Analysis of Helicity Parton Densities and their Uncertainties

Journal Article · Fri Aug 15 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.072001· OSTI ID:21134129

Florian, Daniel de; Sassot, Rodolfo; Stratmann, Marco; Vogelsang, Werner ^[1]

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1. Departamento de Fisica, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 1 (1428) Buenos Aires (Argentina)

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 proton-proton (p-p) 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 incorporation of 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.

• OSTI ID: 21134129
• Journal Information: Physical Review Letters, Vol. 101, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.101.072001; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BROOKHAVEN RHIC
DEEP INELASTIC SCATTERING
FLAVOR MODEL
GLOBAL ANALYSIS
GLUONS
HELICITY
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS