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We present an exploratory study consisting in the formulation of arelativistic quantum mechanics to describe the few-nucleon system at lowenergy, starting from the quantum field theoretical chiral Lagrangian involvingpions and nucleons. To this aim we construct a Bakamjian-Thomas mass operatorand perform a truncation of the Fock space which respects at each stage therelativistic covariance. Such truncation is justified, at sufficiently lowenergy, in the framework of a systematic chiral expansion. As an illustrationwe discuss the bound state observables and low-energy phaseshifts of thenucleon-nucleon and pion-nucleon scattering at the leading order of our scheme.Comment: 17 pages, 10 figures. Revised formulation, matches the journal  versio

Bakamjian-Thomas mass operator for few-nucleon systems from chiral dynamics