Color spin wave functions of heavy tetraquark states

Using the variational method, we calculate the mass of the J(P) = 1(+) ud (b) over bar(b) over bar tetraquark containing two identical heavy antiquarks in a nonrelativistic potential model with color confinement and spin hyperfine interaction. In particular, we extend a previous investigation of the model by Brink and Stancu by investigating the effect of including the color anti-sextet component of the diquark configuration as well as using several more Gaussian parametrization for the L = 0 part of the spatial wave function. We find that for the heavy tetraquark, the 6 (6) over bar component among the color singlet bases is negligible and that the previously used specific Gaussian spatial configuration is good enough in obtaining the ground state energy. (C) 2014 Elsevier B.V. All rights reserved.