Abstract

The measured masses of the three charge states of the charmed ${\mathrm{\ensuremath{\Sigma}}}_{\mathit{c}}$ baryon are found to be in disagreement with a sum rule based on the quark model, but relying on no detailed assumptions about the form of the interaction. This poses a significant problem for the charmed baryon sector of the quark model. Other relations among charmed baryon masses are also discussed. \textcopyright{} 1995 The American Physical Society.

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