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The mean free path is an essential characteristic length in disorderedsystems. In microscopic calculations, it is usually approximated by theclassical value of the elastic mean free path. It corresponds to the Boltzmannmean free path when only isotropic scattering is considered, but it isdifferent for anisotropic scattering. In this paper, we work out thecorrections to the so called Boltzmann mean free path due to multiplescattering effects on finite size scatterers, in the s-wave approximation, ie.when the elastic mean free path is equivalent to the Boltzmann mean free path.The main result is the expression for the mean free path expanded in powers ofthe perturbative parameter given by the scatterer density.Comment: 12 page

Corrections to the Boltzmann mean free path in disordered systems with finite size scatterers