A Diquark-Triquark Model for the KN Pentaquark

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We propose a model for the recently discovered Theta+ exotic KN resonance as a novel kind of a pentaquark with an unusual color structure: a color triplet (ud) diquark, coupled to a color anti-triplet (ud s-bar) triquark in a relative P-wave. The state has Jᵖ=1/2+, I=0 and is an antidecuplet of SU(3)f. A rough mass estimate of this pentaquark is close to experiment.