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The concept of diquark is important for understanding hadron structure andhigh-energy particle reactions. We attempt to apply the Regge trajectoryapproach to the doubly heavy diquarks. We present a method for determining theparameters in the diquark Regge trajectory. The spectra of diquarks $(cc)$,$(bb)$, and $(bc)$ are obtained by using the {\rt} approach and are found toagree with other theoretical results. The diquark Regge trajectory becomes anew and very simple approach for estimating the spectra of diquarks.

Regge trajectories for the doubly heavy diquarks