2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43942Pentaquark baryons $Θ^{+}$ and $Ξ^{--}$ are studied in the dual gravity theory of QCD in which simple mass formulae of pentaquarks are derived in the Maldacena prototype model for supersymmetric QCD and a more realistic model for ordinary QCD. In this approach it is possible to explain the extremely narrow decay widths of pentaquarks. With the aim of constructing more reliable mass formulae, a sketch is given on spin and the hyperfine interaction in the string picture.talk given by A. Sugamoto at International Workshop PENTAQUARK04, July 20-23 (2004) at SPring-8; to appear in the proceedingsHigh Energy Physics - Phenomenologytext