Using the variational method, we calculate the mass of the J P = 1 + udb-b- 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 66- 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.
Bibliographical noteFunding Information:
We would like to thank S. Takeuchi for useful discussions. This work was supported by the Korean Research Foundation under Grant Nos. KRF-2011-0020333 and KRF-2011-0030621 .
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics