Abstract
The attractive Hubbard model on a 2D square lattice is studied at low electonic densities usin the ladder approximation for the pair susceptibility. This model includes (i) the short coherence lenghts known to exist experimentally in the cuprate superconductors, and (ii) two-particle bound states that correspond to electron pairs. We study the quasiparticle lifetimes in both non-self-consistent theories, the latter including interactions between the pairs. We find that if we include the interactions between pairs the quasiparticle lifetimes vary approximately linearly with the inverse temperature, consistent with experiment.
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