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

Ethier, Jacob J.; Sato, Nobuo; Melnitchouk, Wally

doi:10.1103/PhysRevLett.119.132001

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

Journal Article · Tue Sep 26 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.132001· OSTI ID:1395951

Ethier, Jacob J. ^[1]; Sato, Nobuo ^[2]; Melnitchouk, Wally ^[3]

College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Univ. of Connecticut, Storrs, CT (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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.

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

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: Jefferson Lab Angular Momentum (JAM) Collaboration

Grant/Contract Number:: AC05-06OR23177; FG-04ER41309

OSTI ID:: 1395951

Alternate ID(s):: OSTI ID: 1394857

Report Number(s):: JLAB-THY-17-2464; DOE/OR/23177-4135; arXiv:1705.05889

Journal Information:: Physical Review Letters, Vol. 119, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 122 works

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