  The behavior of charged pion masses in the presence of a static uniform
magnetic field is studied in the framework of the two-flavor NJL model, using a
magnetic field-independent regularization scheme. Analytical calculations are
carried out employing the Ritus eigenfunction method, which allows us to
properly take into account the presence of Schwinger phases in the quark
propagators. Numerical results are obtained for definite model parameters,
comparing the predictions of the model with present lattice QCD results.
