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Within the framework of nonrelativistic quark-antiquark Cornell potentialmodel formalism, we study the annihilation of heavy quarkonia. We determinetheir annihilation widths resulting into digluon, dilepton, $3\gamma$, $3g$ and$\gamma gg$ and compare our findings with the available theoretical results andexperimental data. We also provide the charge radii and absolute square ofradial Schr\"odinger wave function at zero quark-antiquark separation for heavyquarkonia and $B_c$ mesons.

Spectroscopy of heavy-heavy flavour mesons and annihilation widths of quarkonia