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

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 t...

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Bibliographic Details
Published in:Physical review letters 2018-04, Vol.120 (15), p.152502-152502, Article 152502
Main Authors: Lin, H-W, Melnitchouk, W, Prokudin, A, Sato, N, Shows, H
Format: Article
Language:English
Subjects:
Computer simulation
electron-ion collisions
hybrid Monte Carlo algorithm
Inelastic scattering
lattice field theory
lattice QCD
Monte Carlo simulation
NUCLEAR PHYSICS AND RADIATION PHYSICS
nucleon distribution
polarization phenomena
Quantum chromodynamics
Quarks
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Summary: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}.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.152502