ar X iv : h ep - p h / 03 11 03 0 v 2 16 A pr 2 00 4 Light pseudoscalar mesons in a nonlocal SU ( 3 ) chiral quark model

ar X iv : h ep - p h / 03 08 31 8 v 1 2 9 A ug 2 00 3 On the structure of the scalar and D mesons

The qq spectrum is studied within a chiral constituent quark model. It provides with a good fit of the available experimental data from light (vector and pseudoscalar) to heavy mesons. The new D states measured at different factories are studied. The 0 ++ light mesons are analyzed as q ¯ q pairs or tetraquark structures.

ar X iv : h ep - p h / 03 09 01 1 v 1 1 S ep 2 00 3 Two - photon decays of π 0 , η and η ′

We investigate the decays of π 0 , η and η ′ into two photons in an effective U (3) chiral Lagrangian approach without employing large N c arguments. Tree level and one-loop contributions from the anomalous Wess-Zumino-Witten Lagrangian are calculated and the importance of η-η ′ mixing and isospin violation due to different up-and down-quark masses is discussed. Unitarity corrections beyond one...

ar X iv : h ep - p h / 02 03 04 2 v 2 4 A pr 2 00 2 Once more on mixing of the a 0 ( 980 ) and f 0 ( 980 ) mesons

ar X iv : h ep - p h / 03 04 14 0 v 1 1 5 A pr 2 00 3 Vector particles in Quasilocal Quark Models

We consider the Quasilocal Quark Model of NJL type including vector and axial-vector four-fermion interaction with derivatives. The mass spectrum for the ground and first excited states is obtained. The chiral symmetry restoration sum rules in these channels are imposed as matching rules to QCD at intermediate energies and a set of constraints on parameters of QQM is performed.

ar X iv : h ep - p h / 03 10 04 0 v 1 3 O ct 2 00 3 A study of pentaquark Θ state in the chiral SU ( 3 ) quark model

The structure of the pentaquark state uudd-¯ s is studied in the chiral SU (3) quark model as well as in the extended chiral SU (3) quark model, in which the vector meson exchanges are included. Four configurations of J π = 1 2 − and four of J π = 1 2 + are considered. The results show that the isospin T = 0 state is always the lowest one for both J π = 1 2 − and J π = 1 2 + cases in various mo...