Estudo da espectroscopia de massas de mesons segundo um modelo de potencial inspirado em cromodinamica quantica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Since the discovery of QCD (Quantum Chromodynamics), there have been remarkable technical achievements in perturbative calculations applied to hadrons. However, it is difficult to use QCD directly to compute hadronic properties. In this context, phenomenological potential models have provided extremely satisfactory results on description of ordinary hadrons, more speci.cally about quark - antiquark bound states (mesons). In this work we propose and study the main aspects in the construction of a potential model and search a generalized description of meson spectroscopy, with emphasis in heavy quark bound states. We analyze important aspects in the choice of the treatment in good agreement with the dynamics of interacting particles, attempting to relativistic aspects as well as to the possibilities of nonrelativistic approximation, applied with success to heavy quarkonium systems in an effective Hamiltonian analysis. Initially the " soft QCD " is employed to determine effective potential terms establishing the asymptotic Coulomb term from one glúon exchange approximation. At the same time, a linear confinement term is introduced in accordance with QCD and phenomenological prescription. We perform the calculations of mass spectroscopy for particular sets of mesons and we verify whether the potential model could be extended to calculating the electronic transition rate ( G (q` q ® e - e+ )). Finishing, we discuss the real physical possibilities of development of a generalized potential model (all quark .avors), its possible advantages relative to experimental parameterization, complexity in numerical calculations and in the description of physical reality in agreement with a quantum field theory (QCD)

ASSUNTO(S)

quarks espectroscopia de massa mesons

ACESSO AO ARTIGO

Documentos Relacionados