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The mechanism of CP violation remains one of the puzzles in particle physics.Key to understanding this phenomenon are nonleptonic $B$ decays, especiallymultibody decays which exhibit large CP asymmetries in various regions of phasespace. A full QCD-based theoretical description of these decays is stillmissing, requiring the use of models to fit the data. In this paper, we suggesta model ansatz which reflects the underlying physics and the known mechanism ofCP violation via the CKM matrix. In addition, since CP violation is driven bythe interference between amplitudes with and without valence charm quarks, weargue that the opening of the open-charm threshold may play an important rolein generating CP violation in the high invariant mass region. We present anatural extension of the isobar model to incorporate these effects. We suggestan analysis of nonleptonic three-body $B$ decay data including this extension,which would be interesting as it may give new hints to the sources of CPviolation both at low and high invariant mass.

CP Violation in Three-body $B$ Decays: A Model Ansatz