  We propose a mean field framework in which the charge and the parity
symmetries of a single-particle state are broken. We break these symmetries to
incorporate the correlation induced by the tensor force into a nuclear mean
field model. We perform the charge- and the parity projections before variation
and obtain a Hartree-Fock-like equation (charge- and parity-projected
Hartree-Fock equation), which is solved self-consistently. We apply the
Hartree-Fock-like equation to the alpha particle and find that, by breaking the
parity and the charge symmetries, the correlation induced by the tensor force
is obtained.
