The NJL model and strange-quark matter
Dipartimento di Fisica Teorica, Università di Torino and
INFN, Sezione di Torino Via P. Giuria 1, 10125 Torino, Italy
Accepted: 12 November 2002
The stability of strange-quark matter is studied within the Nambu Jona-Lasinio model with three different parameter sets. The model Lagrangian contains 4-fermion (with and without vector interaction) and 6-fermion terms; the minimum energy per baryon number as a function of the strangeness fraction of the system is compared to the masses of hyperons having the same strangeness fraction, and coherently calculated in the same version of the model, and for the same parameter set. The results show that in none of the different parameter sets strangelets are stable, and in some cases a minimum in the energy per baryon does not even exist.
PACS: 12.39.-x – Phenomenological quark models / 14.20.Jn – Hyperons / 12.38.Mh – Quark-gluon plasma
© EDP Sciences, 2003