Proposed Tbc Tetraquark Near the B^* D -  Threshold

The proposed Tbc tetraquark near the B^* D ? threshold is investigated using a first-order model assuming weakly interacting bu ?  plus cd ?  meson clusters. The Tbc model yields a Jπ = 0+ and 1+ values in agreement with other analysis, and also suggests a 2+ possible assignment. Depending on the assumed spin and parity of each meson cluster, the model yields mass values in the range of 6.9028 – 7.0804 GeV/c2. These values are in reasonable agreement of 7.0944 – 7.1514 GeV/c2 with proposed lattice QCD values.