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.
@article{arxiv.1710.09858,
title = {First Monte Carlo global analysis of nucleon transversity with lattice QCD constraints},
author = {Huey-Wen Lin and W. Melnitchouk and Alexei Prokudin and N. Sato and H. Shows},
journal= {arXiv preprint arXiv:1710.09858},
year = {2018}
}