Constraints on spin-dependent parton distributions at large x from global QCD analysis

Jimenez-Delgado, P.; Avakian, H.; Melnitchouk, W.

doi:10.1016/j.physletb.2014.09.049

Title: Constraints on spin-dependent parton distributions at large x from global QCD analysis

Full Record
Other Related Research

Abstract

This study investigate the behavior of spin-dependent parton distribution functions (PDFs) at large parton momentum fractions x in the context of global QCD analysis. We explore the constraints from existing deep-inelastic scattering data, and from theoretical expectations for the leading x → 1 behavior based on hard gluon exchange in perturbative QCD. Systematic uncertainties from the dependence of the PDFs on the choice of parametrization are studied by considering functional forms motivated by orbital angular momentum arguments. Finally, we quantify the reduction in the PDF uncertainties that may be expected from future high-x data from Jefferson Lab at 12 GeV.

Authors:: Jimenez-Delgado, P.; Avakian, H.; Melnitchouk, W.

Publication Date:: Sat Nov 01 00:00:00 EDT 2014

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE

Contributing Org.:: Jefferson Lab Angular Momentum (JAM) Collaboration

OSTI Identifier:: 1198368

Alternate Identifier(s):: OSTI ID: 1158670

Grant/Contract Number:: AC05-06OR23177

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 738 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Jimenez-Delgado, P., Avakian, H., and Melnitchouk, W. Constraints on spin-dependent parton distributions at large x from global QCD analysis.  Netherlands: N. p., 2014. 
Web.  doi:10.1016/j.physletb.2014.09.049.

Copy to clipboard


                    Jimenez-Delgado, P., Avakian, H., & Melnitchouk, W. Constraints on spin-dependent parton distributions at large x from global QCD analysis.  Netherlands.  https://doi.org/10.1016/j.physletb.2014.09.049

Copy to clipboard


                    Jimenez-Delgado, P., Avakian, H., and Melnitchouk, W. Sat .  
"Constraints on spin-dependent parton distributions at large x from global QCD analysis".  Netherlands.  https://doi.org/10.1016/j.physletb.2014.09.049.

Copy to clipboard


                    
@article{osti_1198368,

  title        = {Constraints on spin-dependent parton distributions at large x from global QCD analysis},

  author       = {Jimenez-Delgado, P. and Avakian, H. and Melnitchouk, W.},

  abstractNote = {This study investigate the behavior of spin-dependent parton distribution functions (PDFs) at large parton momentum fractions x in the context of global QCD analysis. We explore the constraints from existing deep-inelastic scattering data, and from theoretical expectations for the leading x → 1 behavior based on hard gluon exchange in perturbative QCD. Systematic uncertainties from the dependence of the PDFs on the choice of parametrization are studied by considering functional forms motivated by orbital angular momentum arguments. Finally, we quantify the reduction in the PDF uncertainties that may be expected from future high-x data from Jefferson Lab at 12 GeV.},

  doi          = {10.1016/j.physletb.2014.09.049},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 738,

  place        = {Netherlands},

  year         = {Sat Nov 01 00:00:00 EDT 2014},

  month        = {Sat Nov 01 00:00:00 EDT 2014}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2014.09.049

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 30 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Proton spin structure from Monte Carlo global QCD analyses

Thesis/Dissertation

Although significant progress has been made in recent years in understanding the composition of the proton's spin from its quark and gluon constituents, a complete picture has yet to emerge. Such information is encoded in spin-dependent parton distribution functions (PDFs) that, as a consequence of being inherently nonperturbative, must be extracted through global QCD analyses of polarized lepton-nucleon and proton-proton collisions. Experiments that measure a final state hadron from these reactions are particularly useful for separating the individual quark and anti-quark polarizations, but require knowledge of parton-to-hadron fragmentation functions (FFs) to describe theoretically.In this thesis, we present a new approachmore »« less
https://doi.org/10.2172/1468927

Full Text Available
Proton Spin Structure from Simultaneous Monte Carlo Global QCD Analysis

Thesis/Dissertation Zhou, Yiyu

Despite the great effort and achievements made towards understanding proton spin structure in the past few decades, a complete picture is still elusive. Parton distribution functions (PDFs), which in quantum chromodynamics (QCD) encode the momentum and helicity distributions of quarks and gluons inside a proton, provide the means by which to quantify the proton structure information. Being inherently nonperturbative, PDFs have to be extracted from unpolarized and polarized lepton-hadron and hadron-hadron scattering data. In particular, experiments that measure unpolarized and polarized jet observables can provide insight into the momentum and helicity distributions of gluons, which have generally been more difficultmore »« less
https://doi.org/10.21220/9K5N-4T96

Full Text Available
Iterative Monte Carlo analysis of spin-dependent parton distributions

Journal Article Sato, Nobuo ; Melnitchouk, Wally ; Kuhn, Sebastian E. ; ... - Physical Review D

We present a comprehensive new global QCD analysis of polarized inclusive deep-inelastic scattering, including the latest high-precision data on longitudinal and transverse polarization asymmetries from Jefferson Lab and elsewhere. The analysis is performed using a new iterative Monte Carlo fitting technique which generates stable fits to polarized parton distribution functions (PDFs) with statistically rigorous uncertainties. Inclusion of the Jefferson Lab data leads to a reduction in the PDF errors for the valence and sea quarks, as well as in the gluon polarization uncertainty at x ≳ 0.1. Furthermore, the study also provides the first determination of the flavor-separated twist-3 PDFsmore »« less
Cited by 100
https://doi.org/10.1103/PhysRevD.93.074005

Full Text Available
Monte Carlo Global QCD Analyses of the Pion Parton Distribution Functions

Thesis/Dissertation Barry, Patrick

As the lightest hadron, the pion presents itself as a dichotomy. While being the pseudo Goldstone boson associated with chiral symmetry breaking, it is simultaneously regarded as the lightest pseudoscalar meson typically composed of constituent quark and antiquark. As the chiral symmetry shares the same global symmetry as QCD, studying the pion and its internal structure is key in understanding one of the four fundamental forces of nature, namely the quantum chromodynamic strong interaction. We study the pion's parton distribution functions (PDFs), which are universal quantities that describe the structure of the pion in terms of its constituent quarks, antiquarks,more »« less
Full Text Available
First Monte Carlo Global QCD Analysis of Pion Parton Distributions

Journal Article Barry, P. C. ; Sato, N. ; Melnitchouk, W. ; ... - Physical Review Letters

Here, we perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, combiningmore »« less
Cited by 94
https://doi.org/10.1103/PhysRevLett.121.152001

Similar Records