First Simultaneous Extraction of Spin-Dependent Parton Distributions and Fragmentation Functions from a Global QCD Analysis
Journal
Physical Review Letters
Journal Volume
119
Journal Issue
13
Date Issued
2017
Author(s)
Abstract
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. 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. ? 2017 American Physical Society.
Subjects
Inelastic scattering; Iterative methods; Monte Carlo methods; Polarization; Combined analysis; Direct extraction; E+e- annihilation; Fragmentation functions; Parton distributions; Quark polarization; Semi-inclusive deep-inelastic scatterings; Simultaneous extractions; Extraction; article; destruction; extraction; flavor; Monte Carlo method; polarization; quark
SDGs
Type
journal article