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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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v80_n3_p_DeFlorian http://hdl.handle.net/20.500.12110/paper_15507998_v80_n3_p_DeFlorian |
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paper:paper_15507998_v80_n3_p_DeFlorian2023-06-08T16:22:09Z 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 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v80_n3_p_DeFlorian 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. |
| title |
Extraction of spin-dependent parton densities and their uncertainties |
| spellingShingle |
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 |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v80_n3_p_DeFlorian http://hdl.handle.net/20.500.12110/paper_15507998_v80_n3_p_DeFlorian |
| _version_ |
1768543293811982336 |