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  • Letter
  • Open Access

Polarized antimatter in the proton from a global QCD analysis

C. Cocuzza1, W. Melnitchouk2, A. Metz1, and N. Sato2 (Jefferson Lab Angular Momentum (JAM) Collaboration)

  • 1Department of Physics, SERC, Temple University, Philadelphia, Pensylvannia 19122, USA
  • 2Jefferson Lab, Newport News, Virginia 23606, USA

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Phys. Rev. D 106, L031502 – Published 23 August, 2022

DOI: https://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 Δu¯−Δd¯, 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 Δu¯/u¯ and Δd¯/d¯ and determine the signs of the truncated contributions to the proton spin from the light antiquarks.

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Information

Phys. Rev. D 106, L031502– Published 23 August, 2022
  • Received 11 February 2022
  • Revised 7 June 2022
  • Accepted 3 August 2022
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