Negative-Parity Heavy Pentaquark States in 1/N_c

Abstract

The 1/N_c expansion for negative-parity heavy pentaquarks is developed using the formalism introduced for excited baryons in large N_c. Relations are found between the mass splittings of these pentaquarks and those of nonexotic baryons.

Comments: 14 pages, 3 figures; v2: footnotes and references added, typos corrected; v3: some entries in Table II and equation (12) corrected