Influence of the Dirac sea on proton electromagnetic knockout
Nuclear Theory
2009-11-11 v1
Abstract
We use the relativistic distorted-wave impulse approximation (RDWIA) to study the effects of negative-energy components of Dirac wave functions on the left-right asymmetry for (e,e'p) reactions on 16-O with 0.2 < Q^2 < 0.8 and 12-C with 0.6 < Q^2 < 1.8 (GeV/c)^2. Spinor distortion is more important for the bound state than for the ejectile and the net effect decreases with Q^2. Spinor distortion breaks Godon equivalence and the data favor the CC2 operator with intermediate coupling to the sea. The left-right asymmetry for Q^2 < 1.2 (GeV/c)^2 is described well by RDWIA calcuations, but at Q^2 = 1.8 (GeV/c)^2 the observed variation with missing momentum is flatter than predicted.
Keywords
Cite
@article{arxiv.nucl-th/0501078,
title = {Influence of the Dirac sea on proton electromagnetic knockout},
author = {James J. Kelly},
journal= {arXiv preprint arXiv:nucl-th/0501078},
year = {2009}
}
Comments
12 pages, 9 figures, to be submitted to PRC