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The Feynman-Hellmann theorem and semiempirical mass formulas are used topredict the masses of baryons containing one or two heavy quarks. Inparticular, the mass of the $\Lambda_b$ is predicted to be $5620 \pm 40$ MeV, avalue consistent with measurements.Comment: 11 pages, Plain TeX, 2 figures (not included, available on request  from lichten@photon.physics.indiana.edu

Predicting the masses of baryons containing one or two heavy quarks