Axial vector cc and bb diquark masses from QCD Laplace sum rules

Constituent mass predictions for axial vector (i.e., J(P) = 1(+)) cc and bb color-antitriplet diquarks are generated using QCD Laplace sum rules. We calculate the diquark correlator within the operator product expansion to next-to-leading order, including terms proportional to the four- and six-dimensional gluon and six-dimensional quark condensates. The sum-rule analyses stabilize, and we find that the constituent mass of the cc diquark is (3.51 +/- 0.35) GeV and the constituent mass of the bb diquark is (8.67 +/- 0.69) GeV. Using these diquark constituent masses as inputs, we calculate several tetraquark masses within the type-II diquark-antidiquark tetraquark model.