M. L. L. da Silva

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.

Do glueballs contribute in heavy-ion collisions?

In heavy-ion collision simulations many hadron states and/or parton degrees of freedom are included in order to obtain the observables. Meson spectroscopy, for example, considers the 0++ meson as a mixture of and glue. This fact is usually not considered in heavy-ion collision physics. In the present work, we consider two extreme possibilities for the constitution of the 0++ meson, either as a pure glueball or as meson. The scattering amplitude and cross sections with constituent interchange are determined for the two situations. The comparison showed that the glueball–glueball elastic scattering cross section for a colour singlet state is between one to two orders of magnitude smaller than the corresponding state. The 2++ glueball–glueball interaction is also evaluated with similar behaviour. Thus, glueball–glueball scattering is not very likely to introduce significant changes in heavy-ion collision observables.

LIGHT MESON DECAY IN THE

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

MODEL

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

Deciphering charmoniumlike exotic states in photon - hadron interactions at RHIC and LHC energies

model

C3P0 MODEL FOR CHARMED MESONS DECAY

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

STRANGE MESON DECAY IN THE C3P0 MODEL

retains the basic aspects of the

GLUEBALL-QUARKONIA MIXTURE IN THE f0(1710) DECAY

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

LIGHT QUARKONIA DECAYS IN THE CORRECTED 3P0 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