1,688 research outputs found
Scalar mesons nonet in a scaled effective Lagrangian
A scaled SU(3) Nambu - Jona-Lasinio Lagrangian is used to compute the mass of
the nine scalar mesons in the vacuum and the mass of the gluball. It is shown
that a suitable choice of the vacuum gluon condensate allows to reproduce the
experimental masses of the scalar mesons except for the {}(1430). This
choice corresponds to a weak coupling between the gluon and quark condensates,
giving a {}(1500) or a {}(1710) which is nearly a pure glueball.Comment: 12 pages, Latex, use elsart.st
Phase transition and thermodynamics of a hot and dense system in a scaled NJL model
The chiral phase transition of a hot and dense system of quarks is studied
within a modified SU(3) NJL lagrangian that implements the QCD scale anomaly.
The u- and s-quark condensates can feel or not the same chiral restoration
depending on the considered region of the 3-dimension space T_c(\mu_uc,\mu_sc).
The temperature behaviour of the pressure and of the energy and entropy
densities of the u- and s-quark system is investigated. At high temperature,
the non-vanishing bare s-quark mass only modifies slightly the usual behaviour
associated with an ideal quark gas.Comment: 23 pages, LaTeX, uses elsart.sty. This version of the paper includes
the figures (ps
A General Approach of Quasi-Exactly Solvable Schroedinger Equations with Three Known Eigenstates
We propose a general method for constructing quasi-exactly solvable
potentials with three analytic eigenstates. These potentials can be real or
complex functions but the spectrum is real. A comparison with other methods is
also performed
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