Xi. sub c and baryon spectroscopy

Baryon masses are computed in a semirelativistic quark model. We determine quark distances in baryons on the basis of solutions of three-body harmonic oscillators and modifying them by forces due to the Fermi-Breit terms. We reproduce all the well-known {ital s}-wave baryon masses within {plus minus}9-MeV accuracy. We conclude that the {ital csu} state of 2465.4{plus minus}4.0{plus minus}1.5 MeV is {Xi}{sub {ital c}}{sup {prime}+} with the antisymmetric {ital su} flavor state and the {ital csd} state of 2471{plus minus}3{plus minus}4 MeV is {Xi}{sub {ital c}}{sup {prime}0} with the antisymmetric {ital sd} flavor state. To confirm these, it is important to find another {ital csu} baryon {Xi}{sub {ital c}}{sup +} near 2580 MeV and another {ital csd} baryon {Xi}{sub {ital c}}{sup 0} near 2579 MeV, which may decay to {Xi}{sub {ital c}}{sup {prime}+}+{gamma} and {Xi}{sub {ital c}}{sup {prime}0}+{gamma}, respectively. We also give other charmed baryon masses.