Subtracted Dispersion Relations for In-Medium Meson Correlators in QCD Sum Rules
Nuclear Theory
2009-10-31 v1 High Energy Physics - Phenomenology
Abstract
We analyze subtracted dispersion relations for meson correlators at finite baryon density and temperature. Such relations are needed for QCD sum rules. We point out the importance of scattering terms, as well as finite, well-defined subtraction constants. Both are necessary for consistency, in particular for the equality of the longitudinal and transverse correlators in the limit of the vanishing three-momentum of mesons relative to the medium. We present detailed calculations in various mesonic channels for the case of the Fermi gas of nucleons.
Cite
@article{arxiv.nucl-th/9901059,
title = {Subtracted Dispersion Relations for In-Medium Meson Correlators in QCD Sum Rules},
author = {W. Florkowski and W. Broniowski},
journal= {arXiv preprint arXiv:nucl-th/9901059},
year = {2009}
}