The processes of particle diffusion and acceleration are currently being tackled worldwide because of their major implications in astrophysical and laboratory plasma physics. Despite the efforts of the whole community, a comprehensive theoretical description of such phenomena is still missing. In this work, a two-dimensional (2D) version of the Non-Linear Guiding Center (NLGC) theory is
derived, in order to describe particle transport in some particular scenarios. The theory is validated with 2.5D kinetic simulations of plasma turbulence. Simulations
parameters are chosen so that several scenarios can be described, going from the solar corona to the solar wind and the magnetosheath. Finally, the role of turbulence
coherent structures on particle acceleration and energization is investigated. Current sheets are found to be of major importance in this scenario and that there is a scale-resonance interaction between the current sheet size and the particles’ Larmor radii
