Effects of diagonal disorder on charge density wave and superconductivity in local pair systems

We analyse the influence of diagonal disorder (random site energy) on charge density wave (CDW) and superconductivity (SS) in local pair systems which are described by the model of hard core charged bosons on a lattice. This problem was previously studied within the mean field approximation for the case of half-filled band (n=1). Here we extend that investigation to the case of arbitrary particle concentration (0