New insights into the spin structure of the nucleon
High Energy Physics - Phenomenology
2015-06-11 v1 Nuclear Theory
Abstract
We analyze the low-energy spin structure of the nucleon in a covariant effective field theory with explicit spin-3/2 degrees of freedom to third order in the small scale expansion. Using the available data on the strong and electromagnetic width of the Delta-resonance, we give parameter-free predictions for various spin-polarizabilities and moments of spin structure functions. We find an improved description of the nucleon spin structure at finite photon virtualities for some observables and point out the necessity of a fourth order calculation.
Keywords
Cite
@article{arxiv.1209.2523,
title = {New insights into the spin structure of the nucleon},
author = {V. Bernard and E. Epelbaum and H. Krebs and U. -G. Meißner},
journal= {arXiv preprint arXiv:1209.2523},
year = {2015}
}
Comments
13 pages, 6 figures