2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37725Recent evidence for pentaquark baryons is critically reviewed in the light of new high statistics data. The search of the WA89 experiment for the $Ξ^{--}(1860)$ is presented in detail and consequences of its non-observations are discussed.16 pages, 9 figuresHigh Energy Physics - Experimenttext