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The mass spectra of heavy and light mesons is computed within the frameworkof the relativistic flux tube model. A good agreement with the experimentaldata is obtained provided that the flux tube contributions, includingretardation and spin-orbit effects, are supplemented by a one-gluon-exchangepotential, a quark self-energy term and instanton-induced interactions. Noarbitrary constant is needed to fit the absolute scale of the mass spectra, andthe different parameters are fitted on lattice QCD in order to stronglyrestrict the arbitrariness of our model. The relevance of the present approachis discussed in the case of glueballs, and the glueball spectrum we compute iscompared to the lattice QCD one. Finally, we make connections between theresults of our model and the nature of some newly discovered experimentalstates such as the f_0(1810), X(3940), Y(3940), etc.

Meson and glueball spectra with the relativistic flux tube model