  We investigate the ExB diffusion of fusion born \alpha particles in tokamak
plasmas. We determine the transport regimes for a realistic model that has the
characteristics of the ion temperature gradient (ITG) or of the trapped
electron modes (TEM) driven turbulence. It includes a spectrum of potential
fluctuations that is modeled using the results of the numerical simulations,
the drift of the potential with the effective diamagnetic velocity and the
parallel motion. Our semi-analytical statistical approach is based on the
decorrelation trajectory method (DTM), which is adapted to the gyrokinetic
approximation. We obtain the transport coefficients as a function of the
parameters of the turbulence and of the energy of the \alpha particle.
According to our results, signficant turbulent transport of the \alpha
particles can appear only at energies of the order of 100KeV. We determine the
corresponding conditions.
