Statistics

Particle physics

Quantum chromodynamics

Physics

Inelastic scattering

Nucleon

Nuclear physics

Scattering

Monte Carlo method

Isovector

Mathematics

Asymmetry

Lattice QCD

Lattice field theory

Quantum mechanics

Quark

Deep inelastic scattering

Physical Review Letters

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 g_{T} from lattice QCD. A simultaneous fit to the available SIDIS Collins asymmetry data is compatible with g_{T} values extracted from a comprehensive reanalysis of existing lattice simulations, in contrast to previous analyses, which found significantly smaller g_{T} 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 Q^{2}=2 GeV^{2}.

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