D. Hadjimichef

Meson decay in a corrected P 0 3 model

The 3 P 0 model, in which qq pair production is the dominant mechanism, is extensively applied to both light and heavy meson decay and stands as one of the most successful strong decay models. The pair production can be obtained from the nonrelativistic limit of a microscopic interaction Hamiltonian involving Dirac quark fields. The evaluation of the decay amplitude can be performed by a diagrammatic technique for drawing quark lines. In this paper we use an alternative approach which consists of a mapping technique, the Fock-Tani formalism, in order to obtain an effective Hamiltonian starting from the same microscopic interaction. An additional effect is manifested in this formalism associated to the extended nature of mesons: bound-state corrections. A corrected 3 P 0 is obtained and applied, as an example, to b 1 → ωπ and a 1 → ρπ decays.

Can quark effects be observed in intermediate heavy ion collisions

In recent years a tentative description of the short-range part of hadron interactions with constituent quark interchange has been developed providing an alternative approach to meson physics. Quark interchange plays a role, for example, in the nucleon–nucleon (NN) phase shifts and cross-section. In heavy ion collision simulations at intermediate energies one of the main features is the NN cross-section in the collisional term, where in most cases it is an input adjusted to the free space value. In this paper we introduce the quark degrees of freedom to the NN cross-section in the Vlasov–Uehling–Uhlenbeck (VUU) model and explore the possibility that these effects appear in the observables at lower energies.

LIGHT MESON DECAY IN THE

Having its origin in a successful mapping technique, the Fock–Tani formalism, the corrected

MODEL

{}^{3}\!P_{0}

GLUEBALL-GLUEBALL POTENTIAL IN A CONSTITUENT GLUON MODEL

model

J/ψ DECAY IN THE C3P0 MODEL

({\rm C}\,{}^{3}\!P_{0})

DECAY PROCESS OF THE CHARMED MESON

retains the basic aspects of the

D_{2}^{\ast}\,(2460)

{}^{3}\!P_{0}

IN THE C3P0 Model

predictions with the inclusion of bound-state corrections. Evaluation of the decay amplitudes has been performed for open-flavor strong decays in the light meson sector. The bound-state corrections introduce a fine-tuning for the former