  A recent renormalization group analysis of the effective light-cone
Hamiltonian yields 5 flavor masses and 2 mass shifts as free parameters. These
are determined in the present note and used to calculate the masses of all 30
physical mesons (The topped mesons have been omitted). The agreement between
experiment and theoretical estimate is quite satisfactory over the whole
dynamical range, from the lightest pseudo-scalar mesons like the pion up to the
heaviest vector mesons like the upsilon. Evidence for an additive quark model
is given and for how the concept of isospin is realized in a gauge field theory
such as QCD.
