Revealing Color Forces with Transverse Polarized Electron Scattering

(SANE Collaboration)

研究成果: Article査読

16 被引用数 (Scopus)

抄録

The Spin Asymmetries of the Nucleon Experiment measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 and 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons at 40° and covered a wide range in Bjorken x (0.3<x<0.8). Proportional to an average color Lorentz force, the twist-3 matrix element, d2p, was extracted from the measured asymmetries at Q2 values ranging from 2.0 to 6.0 GeV2. The data display the opposite sign compared to most quark models, including the lattice QCD result, and an unexpected scale dependence. Furthermore, when combined with the neutron data in the same Q2 range the results suggest a flavor independent average color Lorentz force.

本文言語English
論文番号022002
ジャーナルPhysical review letters
122
2
DOI
出版ステータスPublished - 2019 1月 18

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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