%0 Journal Article %T Mixing of neutral B mesons and factorization %A A. A. Pivovarov %J Physics %D 1996 %I arXiv %X A brief review of checking the factorization hypothesis for matrix element of $B^0 - \bar B^0$ mixing within operator product expansion and QCD sum rules is given. Both perturbative and power corrections are considered. %U http://arxiv.org/abs/hep-ph/9606482v1