  The effective theory for heavy quarks has additional symmetries with respect
to QCD, which relate charm and beauty hadron masses. Assuming the spectrum of
charmed particles, we predicted in a previous work the masses of some beauty
particles. The predictions of the Lambda_b mass, M(Lambda_b)=5630 MeV, and of
the B_s mass, M(B_s)=5379 MeV, are in agreement with present experimental data.
We continue this work using recent experimental data on charm hadron masses.
The results are: M(Sigma_b)=5822+-6 MeV, M(Sigma_b*)-M(Sigma_b)=33+-3 MeV,
M(Omega_b)=6080+-7 MeV, M(Omega_b*)-M(Omega_b)=32+-3 MeV, M(Lambda_b*)=5945+-3
MeV, M(Lambda_b**)-M(Lambda_b*)=15+-1 MeV. When experimental data for beauty
hadron masses are available, a comparison with the theoretical values allows a
quantitative estimate of the corrections to the static theory, which contain
informations on hadron dynamics at low energy.
