arXiv:2611.09245v1 Announce Type: new Abstract: The purpose of this article is to study the convergence of a lattice Boltzmann method (LBM) for a simple diffusion equation. The LBM is proven to be stable and consistent in some sense, so that convergence results may be obtained. The approach is similar to asymptotic analysis in the literature, although the schemes are also studied for intermediate time scalings. Usually, LBM are used in the range of acoustic regime, where $\delta$t ___ $\delta$x, or in diffusive scaling, with $\delta$t ___ $\delta$x 2 . In this work, we study any intermediate scaling $\delta$t ___ $\delta$x 1+r with r $\in$]0; 1]. The goal is to prove that this scaling is capable of approximating an advection-diffusion equation, provided the relaxation rate is chosen in accordance with $\delta$x. Convergence results are established and match the previously known results in the diffusive regime. The second objective is to prove that several choices for the initial condition are suitable for convergence. In particular, the usual choice of equilibrium distribution at initial time guarantees that the LBM scheme yields an accurate approximation of the macroscopic quantities.