Effects of consistent and inconsistent isobar coupling in the nuclear medium
Abstract
We investigate effects of consistent (conserving the number of degrees of freedom) and inconsistent pion-nucleon-isobar couplings on the isobar propagator in vacuum and in nuclear medium. Using the consistent coupling in conjunction with a convenient basis leads to significant simplification of the isobar vacuum and in-medium self energy and dressed propagator compared to the case of inconsistent interaction. The higher-derivative nature of the consistent interaction requires a suitable compensation by an additional form-factor term or adjustment in the used cut-off values. This modification is straightforward to perform and assures that the physical observables connected to the spin-3/2 sector in vacuum and nuclear medium acquire values indistinguishable from the ones obtained by using an inconsistent coupling.
Cite
@article{arxiv.1112.4265,
title = {Effects of consistent and inconsistent isobar coupling in the nuclear medium},
author = {C. L. Korpa},
journal= {arXiv preprint arXiv:1112.4265},
year = {2015}
}
Comments
9 pages, 6 figures