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This is the second of two companion papers in which we continue to developthe construction of the doubly heavy pentaquark systems using the gauge/stringduality. In this paper, we propose a stringy description of the $Q\bar Qqqq$system in the case of two light flavors. Our goal is to explore the lower-lyingBorn-Oppenheimer potentials as a function of the separation distance betweenthe heavy quark-antiquark pair. The analysis shows that the ground stateBorn-Oppenheimer potential is described in terms of both hadro-quarkonia andhadronic molecules. Meanwhile a standard pentaquark configuration, whichdescribes a genuine five-quark interaction, makes the dominant contribution toa higher lying potential. This configuration has an antiquark-diquark-diquarkstructure $\bar Q[qq][Qq]$ for separations larger than $0.1\,\text{fm}$. Thelatter enables us to establish a relation among the masses of hadrons in theheavy quark limit. To describe the structure of the potentials more clear, wedefine some critical separations that are related to the processes of stringreconnection, breaking and junction annihilation. Additionally, we consider thegeneralized baryon vertices, where more than three strings can meet, andexplore their implications for the pentaquark systems.

$Q\bar Qqqq$ Quark System, Compact Pentaquark, and Gauge/String Duality (Part II)