First Monte Carlo Global Analysis of Nucleon Transversity with Lattice QCD Constraints.
| Autor: | Lin HW; Michigan State University, East Lansing, Michigan 48824, USA., Melnitchouk W; Jefferson Lab, Newport News, Virginia 23606, USA., Prokudin A; Jefferson Lab, Newport News, Virginia 23606, USA.; Penn State Berks, Reading, Pennsylvania 19610, USA., Sato N; University of Connecticut, Storrs, Connecticut 06269, USA., Shows H; Louisiana State University, Baton Rouge, Louisiana 70803, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2018 Apr 13; Vol. 120 (15), pp. 152502. |
| DOI: | 10.1103/PhysRevLett.120.152502 |
| Abstrakt: | 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}. |
| Databáze: | MEDLINE |
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