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Your search keyword '"Oliveira, O."' showing total 14 results
Start Over Author "Oliveira, O." Publication Type Books
14 results on '"Oliveira, O."'

5. CAMINHOS INVESTIGATIVOS: a metodologia em foco Coleção Caminhos investigativos – Volume I

Author

UCHÔA, J.M.S., primary, BEZERRA, M. I. S, additional, COSTA, A. L. O., additional, SANTOS, A. R., additional, LIMA, A. M. C. A., additional, MARTINI, A., additional, SILVA, Anadréia Kelly Araújo da, additional, ROCHA, C. J., additional, CARVALHO, D. M. S., additional, ANDRADE, Erika dos Reis Gusmão, additional, MARTINS, F. A. O., additional, SILVEIRA GROTTI, G. L., additional, ALBINO, Giovana Gomes, additional, CARVALHO, João Carlos de, additional, SILVA, J. A. C., additional, YAUANAWA, J. L., additional, LIMA, M. A. R., additional, PINTO, Maria Dolores de O. S., additional, COSTA, M. J. S. M., additional, OLIVEIRA, O. L., additional, GONÇALVES, Rafael Marques, additional, SELLES, S. E., additional, and SANTOS, T. C., additional

Published
2019
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13. Heavy quarkonia from classical SU(3) Yang-Mills configurations.

Author

Coimbraa, R. A. and Oliveira, O.

Abstract

A generalized Cho-Faddeev-Niemi ansatz for SU(3) Yang-Mills is investigated. The corresponding classical field equations are solved for its simplest parametrization. From these solutions it is possible to define a confining non-relativistic central potential used to study heavy quarkonia. The associated spectra reproduces the experimental spectra with an error of less than 3% for charmonium and 1% for bottomo-nium. Moreover, the recently discovered new charmonium states can be accomodate in the spectra, keeping the same level of precision. The leptonic widths show good agreement with the recent measurements. The charmonium and bottomonium E1 electromagnetic transitions widths are computed and compared with the experimental values. [ABSTRACT FROM AUTHOR]

Published
2007
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14. Infrared gluon and ghost propagators from lattice QCD.

Author

Oliveira, O. and Silva, P. J.

Abstract

We report on the infrared limit of the quenched lattice Landau gauge gluon and ghost propagators as well as the strong-coupling constant computed from large asymmetric lattices. The infrared lattice propagators are compared with the pure power law Solutions from Dyson-Schwinger equations (DSE). For the gluon propagator, the lattice data is compatible with the DSE solution. The preferred measured gluon exponent being ∼ 0.52, favouring a vanishing propagator at zero momentum. The lattice ghost propagator shows finite-volume effects and, for the volumes considered, the propagator does not follow a pure power law. Furthermore, the strong-coupling constant is computed and its infrared behaviour investigated. [ABSTRACT FROM AUTHOR]

Published
2007
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