Loading...
Polarized antimatter in the proton from a global QCD analysis
Cocuzza, C. Melnitchouk, W. Metz, A. Sato, N.
Cocuzza, C.
Melnitchouk, W.
Metz, A.
Sato, N.
Citations
Altmetric:
Genre
Journal article
Date
2022-08-23
Advisor
Committee member
Group
Department
Physics
Permanent link to this record
Collections
Research Projects
Organizational Units
Journal Issue
DOI
http://dx.doi.org/10.1103/physrevd.106.l031502
Abstract
We present the first simultaneous global QCD analysis of spin-dependent parton distribution functions alongside their spin-averaged counterparts and pion, kaon, and unidentified hadron fragmentation functions. This analysis includes all data relevant for constraining the polarized light quark sea asymmetry Δ¯u−Δ¯d, in particular the latest polarized W-lepton production data from the STAR Collaboration at RHIC and semi-inclusive deep inelastic scattering data from COMPASS, allowing the most robust extraction available with minimal theoretical assumptions. We also extract a self-consistent set of antiquark polarization ratios Δ¯u/¯u and Δ¯d/¯d and determine the signs of the truncated contributions to the proton spin from the light antiquarks.
Description
Citation
Citation to related work
American Physical Society (APS)
Has part
Physical Review D (particles, fields, gravitation, and cosmology), Vol. 106, Iss. 3
ADA compliance
For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu