  Quarkonia -- mesons made of a heavy quark and anti-quark -- have been
extensively studied experimentally. Theoretical calculations of quarkonia based
on lattice QCD are possible with control over the systematic errors. The
comparison with experimental measurements of the quarkonia spectra leads to
determinations of Standard Model parameters: the strong coupling, $\alpha_s$,
and the heavy quark masses.

High Energy Physics - Phenomenology