skip to main content

DOE PAGESDOE PAGES

Title: First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis

In this paper, we perform the first global QCD analysis of polarized inclusive and semi-inclusive deep-inelastic scattering and single-inclusive $e^+e^-$ annihilation data, simultaneously fitting the parton distribution and fragmentation functions using the iterative Monte Carlo method. Without imposing SU(3) symmetry relations, we find the strange polarization to be very small, consistent with zero for both inclusive and semi-inclusive data, which provides a resolution to the strange quark polarization puzzle. Finally, the combined analysis also allows the direct extraction from data of the isovector and octet axial charges, and is consistent with a small SU(2) flavor asymmetry in the polarized sea.
Authors:
 [1] ;  [2] ;  [3]
  1. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Univ. of Connecticut, Storrs, CT (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Report Number(s):
JLAB-THY-17-2464; DOE/OR/23177-4135; arXiv:1705.05889
Journal ID: ISSN 0031-9007
Grant/Contract Number:
AC05-06OR23177; FG-04ER41309
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Jefferson Lab Angular Momentum (JAM) Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; deep inelastic scattering; quantum chromodynamics; strange quark; Monte Carlo methods; particles & fields
OSTI Identifier:
1395951
Alternate Identifier(s):
OSTI ID: 1394857

Ethier, Jacob J., Sato, Nobuo, and Melnitchouk, Wally. First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis. United States: N. p., Web. doi:10.1103/PhysRevLett.119.132001.
Ethier, Jacob J., Sato, Nobuo, & Melnitchouk, Wally. First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis. United States. doi:10.1103/PhysRevLett.119.132001.
Ethier, Jacob J., Sato, Nobuo, and Melnitchouk, Wally. 2017. "First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis". United States. doi:10.1103/PhysRevLett.119.132001. https://www.osti.gov/servlets/purl/1395951.
@article{osti_1395951,
title = {First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis},
author = {Ethier, Jacob J. and Sato, Nobuo and Melnitchouk, Wally},
abstractNote = {In this paper, we perform the first global QCD analysis of polarized inclusive and semi-inclusive deep-inelastic scattering and single-inclusive $e^+e^-$ annihilation data, simultaneously fitting the parton distribution and fragmentation functions using the iterative Monte Carlo method. Without imposing SU(3) symmetry relations, we find the strange polarization to be very small, consistent with zero for both inclusive and semi-inclusive data, which provides a resolution to the strange quark polarization puzzle. Finally, the combined analysis also allows the direct extraction from data of the isovector and octet axial charges, and is consistent with a small SU(2) flavor asymmetry in the polarized sea.},
doi = {10.1103/PhysRevLett.119.132001},
journal = {Physical Review Letters},
number = 13,
volume = 119,
place = {United States},
year = {2017},
month = {9}
}