We apply the method of QCD sum rules to study the doubly heavy tetraquark
states(QQqΛβqΛβ) with the isospin I=21β and 1 and
spin-parity JPC=1++ and JPC=1+β by constructing all the QQqΛβqΛβ tetraquark currents. The masses of the doubly bottom and
charm tetraquark states are computed in the context of the two-point sum rule
method incorporating the quark, gluon and mixed condensates up to dimension
10. By the way, weak decay widths of the doubly bottom tetraquark
bbuΛdΛ are also given.Comment: 12 pages, 15 figures. This article is created by revtex