  Mixing effects on the mass spectrum of light neutral pseudoscalar and vector
mesons in the presence of an external uniform magnetic field $\vec B$ are
studied in the framework of a two-flavor NJL-like model. The model includes
isoscalar and isovector couplings both in the scalar-pseudoscalar and vector
sectors, and also incorporates flavor mixing through a 't Hooft-like term.
Numerical results for the $B$ dependence of meson masses are compared with
present lattice QCD results. In particular, it is shown that the mixing between
pseudoscalar and vector meson states leads to a significant reduction of the
mass of the lightest state. The role of chiral symmetry and the effect of the
alignment of quark magnetic moments in the presence of the magnetic field are
discussed.
