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We present a path-integral hadronization for doubly heavy baryons. The twoheavy quarks in the baryon are approximated as a scalar or axial-vector diquarkdescribed by a heavy diquark effective theory. The gluon dynamics arerepresented by a NJL-Model interaction for the heavy diquarks and light quarks,which leads to an effective action of the baryon fields after the quark anddiquark fields are integrated out. This effective action for doubly heavybaryon includes the electromagnetic and electroweak interactions, as well asthe interaction with light mesons. We also verify the Ward-Takahashi identityat the baryon level, obtain the Isgur-Wise function for weak transitions, andcalculate the strong coupling constant of the doubly heavy baryon and pion.Numerical studies are also performed.

Hadronization of heavy diquark and light quark within NJL-Model