Resonance-Parton Duality in $(e,e'\pi)$ off Nucleons
Abstract
Regge-pole based descriptions of pion-electroproduction on nucleons have given a very good description of the longitudinal components of the cross sections. However, these very same models grossly underestimate the transverse components. A related problem appears in QCD-based scaling arguments that predict the predominance of longitudinal over transverse electroproduction of pions by terms . However, data from JLAB, Cornell and DESY, covering a wide kinematical range and , do not show this expected behavior. We address here this issue of the transverse response in pion-electroproduction by considering the contributions of high-lying ( GeV) nucleon resonances to pion production. The coupling strengths and form factors are obtained through resonance-parton duality. We show that in a wide range of electron energies and four-momentum transfers such a model describes all the available data very well.
Keywords
Cite
@article{arxiv.1111.2610,
title = {Resonance-Parton Duality in $(e,e'\pi)$ off Nucleons},
author = {Murat Kaskulov and Ulrich Mosel},
journal= {arXiv preprint arXiv:1111.2610},
year = {2015}
}
Comments
Proc. Erice School 2001: "From Quarks and Gluons to Hadrons and Nuclei", Sept. 16 - 24, 2011, Erice, Italy