Extraction of spin-dependent parton densities and their uncertainties

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 signif...

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Autores principales: De Florian, D., Sassot, R., Stratmann, M., Vogelsang, W.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15507998_v80_n3_p_DeFlorian
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_15507998_v80_n3_p_DeFlorian2023-10-03T16:24:14Z Extraction of spin-dependent parton densities and their uncertainties De Florian, D. Sassot, R. Stratmann, M. Vogelsang, W. 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 500GeV center-of-mass system energy at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, as well as for W boson production. © 2009 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v80_n3_p_DeFlorian
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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 500GeV center-of-mass system energy at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, as well as for W boson production. © 2009 The American Physical Society.
format JOUR
author De Florian, D.
Sassot, R.
Stratmann, M.
Vogelsang, W.
spellingShingle De Florian, D.
Sassot, R.
Stratmann, M.
Vogelsang, W.
Extraction of spin-dependent parton densities and their uncertainties
author_facet De Florian, D.
Sassot, R.
Stratmann, M.
Vogelsang, W.
author_sort De Florian, D.
title Extraction of spin-dependent parton densities and their uncertainties
title_short Extraction of spin-dependent parton densities and their uncertainties
title_full Extraction of spin-dependent parton densities and their uncertainties
title_fullStr Extraction of spin-dependent parton densities and their uncertainties
title_full_unstemmed Extraction of spin-dependent parton densities and their uncertainties
title_sort extraction of spin-dependent parton densities and their uncertainties
url http://hdl.handle.net/20.500.12110/paper_15507998_v80_n3_p_DeFlorian
work_keys_str_mv AT defloriand extractionofspindependentpartondensitiesandtheiruncertainties
AT sassotr extractionofspindependentpartondensitiesandtheiruncertainties
AT stratmannm extractionofspindependentpartondensitiesandtheiruncertainties
AT vogelsangw extractionofspindependentpartondensitiesandtheiruncertainties
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