Two-photon and two-gluon decays of p-wave heavy quarkonium using a covariant light-front approach

In this paper, a study of two-photon and two-gluon decays in the context of p-wave heavy quarkonia is presented. Within the covariant light-front framework, the annihilation rates of scalar and tensor quarkonium states are derived. In the absence of free parameters in this case, the results for the charmonium decay widths are consistent with the experimental data. However, in comparison to other theoretical calculations, there are large discrepancies in our results regarding bottomonia.Comment: 19 pages, 3 figures, 3 tables, some typos are corrected, version to be published in Phys. Rev.