First Monte Carlo Global Analysis of Nucleon Transversity with Lattice QCD Constraints

Jefferson Lab Angular Momentum (JAM) Collaboration

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Abstract

We report on the first global QCD analysis of the quark transversity distributions in the nucleon from semi-inclusive deep-inelastic scattering (SIDIS), using a new Monte Carlo method based on nested sampling and constraints on the isovector tensor charge gT from lattice QCD. A simultaneous fit to the available SIDIS Collins asymmetry data is compatible with gT values extracted from a comprehensive reanalysis of existing lattice simulations, in contrast to previous analyses, which found significantly smaller gT values. The contributions to the nucleon tensor charge from u and d quarks are found to be δu=0.3(2) and δd=-0.7(2) at a scale Q2=2 GeV2.

Original languageEnglish (US)
Article number152502
JournalPhysical Review Letters
Volume120
Issue number15
DOIs
StatePublished - Apr 11 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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