A lattice calculation of the nucleon's spin-dependent structure function g_2 revisited
Abstract
Our previous calculation of the spin-dependent structure function g_2 is revisited. The interest in this structure function is to a great extent motivated by the fact that it receives contributions from twist-two as well as from twist-three operators already in leading order of 1/Q^2 thus offering the unique possibility of directly assessing higher-twist effects. In our former calculation the lattice operators were renormalized perturbatively and mixing with lower-dimensional operators was ignored. However, the twist-three operator which gives rise to the matrix element d_2 mixes non-perturbatively with an operator of lower dimension. Taking this effect into account leads to a considerably smaller value of d_2, which is consistent with the experimental data.
Keywords
Cite
@article{arxiv.hep-lat/0011091,
title = {A lattice calculation of the nucleon's spin-dependent structure function g_2 revisited},
author = {M. Gockeler and R. Horsley and W. Kurzinger and H. Oelrich and D. Pleiter and P. E. L. Rakow and A. Schafer and G. Schierholz},
journal= {arXiv preprint arXiv:hep-lat/0011091},
year = {2008}
}
Comments
25 pages, 11 figures