Revealing Color Forces with Transverse Polarized Electron Scattering
Abstract
The Spin Asymmetries of the Nucleon Experiment (SANE) measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 GeV and 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons at 40 and covered a wide range in Bjorken (). Proportional to an average color Lorentz force, the twist-3 matrix element, , was extracted from the measured asymmetries at values ranging from 2.0 to 6.0 GeV. The data display the opposite sign compared to most quark models, including the lattice QCD result, and an apparently unexpected scale dependence. Furthermore when combined with the neutron data in the same range the results suggest a flavor independent average color Lorentz force.
Keywords
Cite
@article{arxiv.1805.08835,
title = {Revealing Color Forces with Transverse Polarized Electron Scattering},
author = {W. Armstrong and H. Kang and A. Liyanage and J. Maxwell and J. Mulholland and L. Ndukum and A. Ahmidouch and I. Albayrak and A. Asaturyan and O. Ates and H. Baghdasaryan and W. Boeglin and P. Bosted and E. Brash and C. Butuceanu and M. Bychkov and P. Carter and C. Chen and J. -P. Chen and S. Choi and M. E. Christy and S. Covrig and D. Crabb and S. Danagoulian and A. Daniel and A. M. Davidenko and B. Davis and D. Day and W. Deconinck and A. Deur and J. Dunne and D. Dutta and L. El Fassi and C. Ellis and R. Ent and D. Flay and E. Frlez and D. Gaskell and O. Geagla and J. German and R. Gilman and T. Gogami and J. Gomez and Y. M. Goncharenko and O. Hashimoto and D. Higinbotham and T. Horn and G. M. Huber and M. Jones and M. K. Jones and N. Kalantarians and H-K. Kang and D. Kawama and C. Keith and C. Keppel and M. Khandaker and Y. Kim and P. M. King and M. Kohl and K. Kovacs and V. Kubarovsky and Y. Li and N. Liyanage and W. Luo and D. Mack and V. Mamyan and P. Markowitz and T. Maruta and D. Meekins and Y. M. Melnik and Z. -E. Meziani and A. Mkrtchyan and H. Mkrtchyan and V. V. Mochalov and P. Monaghan and A. Narayan and S. N. Nakamura and A. Nuruzzaman and L. Pentchev and D. Pocanic and M. Posik and A. Puckett and X. Qiu and J. Reinhold and S. Riordan and J. Roche and O. A. Rondón and B. Sawatzky and M. Shabestari and K. Slifer and G. Smith and L. F. Soloviev and P. Solvignon and V. Tadevosyan and L. Tang and A. N. Vasiliev and M. Veilleux and T. Walton and F. Wesselmann and S. Wood and H. Yao and Z. Ye and J. Zhang and L. Zhu},
journal= {arXiv preprint arXiv:1805.08835},
year = {2019}
}