| Issue |
Europhys. Lett.
Volume 60, Number 3, November I 2002
|
|
|---|---|---|
| Page(s) | 356 - 362 | |
| Section | The physics of elementary particles and fields | |
| DOI | https://doi.org/10.1209/epl/i2002-00272-8 | |
| Published online | 01 October 2002 | |
Kaons and pions in strange quark matter
Centro de Física Teórica, Departamento
de Física, Universidade de Coimbra
P-3004-516 Coimbra, Portugal
Received:
23
April
2002
Accepted:
16
August
2002
The behavior of kaons and pions in strange quark matter in weak
equilibrium is investigated within the SU(3) Nambu-Jona-Lasinio
(NJL) model. This work focuses a region of high densities where
the behavior of mesons has not been explored in the framework of
this model. It is found that above the density where strange
valence quarks appear in the medium, 
, a change
of behavior of different observables is observed indicating a
tendency to the restoration of flavor symmetry. In particular,
the splitting between charge multiplets, K+, K-; K0,
and 
, 
decrease and the low-energy modes
with quantum numbers of K-, 
and , which are
excitations of the Fermi sea, are less relevant than for lower
densities.
PACS: 11.30.Rd – Chiral symmetries / 11.55.Hx – Sum rules / 14.40.Aq – π, K, and η mesons
© EDP Sciences, 2002
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