  The Mott metal-insulator transition in the two-band Hubbard model in infinite
dimensions is studied by using the linearized dynamical mean-field theory
recently developed by Bulla and Potthoff. The phase boundary of the
metal-insulator transition is obtained analytically as a function of the
on-site Coulomb interaction at the $d$-orbital, the charge-transfer energy
between the $d$- and $p$-orbitals and the hopping integrals between $p-d$,
$d-d$ and $p-p$ orbitals. The result is in good agreement with the numerical
results obtained from the exact diagonalization method.
