Extraction of spin-dependent parton densities and their uncertainties

Journal Article · Sat Aug 01 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.034030· OSTI ID:21322359

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 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 one 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, antiquark, 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 the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, as well as for W boson production.

• OSTI ID: 21322359
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 3; Other Information: DOI: 10.1103/PhysRevD.80.034030; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BNL
BROOKHAVEN RHIC
CENTER-OF-MASS SYSTEM
COMPUTERIZED SIMULATION
DEEP INELASTIC SCATTERING
DENSITY
DISTRIBUTION
DISTRIBUTION FUNCTIONS
GEV RANGE 100-1000
GLUONS
HELICITY
LEPTON-NUCLEON INTERACTIONS
LEPTONS
NUCLEONS
PARTICLE PRODUCTION
PIONS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUARK-ANTIQUARK INTERACTIONS
SPIN
TRANSVERSE MOMENTUM
VELOCITY
W MINUS BOSONS
W PLUS BOSONS