Q and Q, T-analogs of Non-commutative Symmetric Functions

We introduce two families of non-commutative symmetric functions that have analogous properties to the Hall-Littlewood and Macdonald symmetric functions. Resume. Nous presentons deux familles des fonctions symetriques non-commutatives qui ont les proprietes analogues aux fonctions symetriques de Hall-Littlewood et de Macdonald.