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$QQ^\prime qq\bar q$ pentaquarks are studied in a potential model, under thehypothesis that they are composite objects of two diquarks and one antiquark.The interaction between two colored objects includes two contributions, onebased on the $q\bar q$ potential in QCD, computed in the gauge/string dualityapproach, and another describing the spin-spin interaction. The model has beenextended to investigate pentaquarks with different quark content, as $Qqqq\barq$ and $Qqqq\bar Q$, the latter including the states observed by LHCb,$P_c(4380)^+$ and $P_c(4450)^+$, later updated, with a new data sample, to$P_c(4312)^+$, $P_c(4440)^+$, and $P_c(4457)^+$.

Heavy pentaquark spectroscopy in the diquark model