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We present a study of mass spectra and electromagnetic couplings of S- andP-wave baryons containing one, two or three heavy quarks, either charm (c) orbottom (b), in the framework of a non-relativistic harmonic oscillator quarkmodel. A simultaneous fit to 41 known masses of heavy baryons (40 singly-heavyand 1 doubly-heavy) shows a r.m.s. deviation of 19 MeV. We presentequal-spacing mass rules for excited baryons which may help to assign quantumnumbers to experimentally observed heavy baryons. Explicit expressions arederived for electromagnetic couplings, both for spin-flavor matrix elements andradial integrals.

Masses and radiative decay widths of S- and P-wave singly-, doubly- and triply-heavy charm and bottom baryons