  We analyze color superconductivity of one massive flavor quark matter at
moderate baryon density with a spin-zero color-sextet condensate. The most
general Higgs-type ground-state expectation value of the order parameter
implies complete breakdown of the SU(3)xU(1) symmetry. However, both the
conventional fourth-order polynomial effective bosonic description, and the
NJL-type fermionic description in the mean-field approximation favor an
enhanced SO(3) symmetry of the ground state. We ascribe this finding to the
failure of the mean-field approximation and propose that a more sophisticated
technique is needed.
