Quarks in nuclear medium
Abstract
Using the quarkmeson coupling (QMC) model we study nuclear matter from the point of view of quark degrees of freedom. As the nucleon model we adopt the MIT bag model and the relativistic constituent quark model, where a square well and harmonic oscillator potentials are used to confine the quarks. We introduce the Lorentzvector type confining potential as well as the Lorentzscalar type one in order to examine how the vector confining potential contributes to the properties of the nucleon and nuclear matter. Next, we perform a redefinition of the scalar field in matter and transform the QMC model to a QHDtype model with a nonlinear scalar potential. The result obtained from QMC is then compared with the potentials which are determined so as to fit various properties of finite nuclei and nuclear matter in relativistic meanfield models. The QMC model provides the parameters $\kappa \sim 20  40$ (fm$^{1}$) and $\lambda \sim 80  400$ for the standard, nonlinear scalar potential. We discuss a relationship between the QMC and QHDtype models in detail.
 Publication:

arXiv eprints
 Pub Date:
 October 2000
 arXiv:
 arXiv:nuclth/0010035
 Bibcode:
 2000nucl.th..10035S
 Keywords:

 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 25 pages + 5 tables + 5 figures