摘要
The newly observed ⊖ + resonance is believed to be a pentaquark with the constituent quarks uudds̄. There are a few options for the constituent quark structure. Some advocate diquark-diquark-antiquark (ud)-(ud)-s̄ while others favor diquark-triquark (ud)-(uds̄) structure. We use the color-spin hyperfine interaction to examine the energy levels of these structures, and we find that the diquark-diquark-antiquark structure is slightly favored. We proceed to write down the flavor triplet and antisextet of the charmed or bottomed exotic baryons with internal qqqqQ̄. quarks. We also estimate the mass of ⊖ c + and ⊖ b + . © 2004 The American Physical Society.