Description:
<jats:p>A short review of our recent work on amplitude parametrizations of three-body hadronic weak <jats:italic>B</jats:italic> and <jats:italic>D</jats:italic> decays is presented. The final states are here composed of three light mesons, namely the various charge <jats:italic>πππ</jats:italic>, <jats:italic>Kππ</jats:italic> and <jats:italic>KK</jats:italic>$ \bar K $ states. These parametrizations are derived from previous calculations based on a quasi-two-body factorization approach where the two-body hadronic final state interactions are fully taken into account in terms of unitary <jats:italic>S</jats:italic>- and <jats:italic>P</jats:italic>-wave <jats:italic>ππ</jats:italic>, <jats:italic>πK</jats:italic> and <jats:italic>K</jats:italic>$ \bar K $ form factors. They are an alternative to the isobar-model description and can be useful in the interpretation of CP asymmetries.</jats:p>