  A variation of sneutrino inflation based on chi^2 potential is considered
where the inflaton and the late-decaying field are sneutrinos of different
generations. The lighter, late-decaying sneutrino dilutes the gravitinos
over-produced after inflaton decay and generates the matter asymmetry. It can
also significantly contribute to the curvature perturbation, realizing the
mixed inflaton-curvaton case. The cosmic microwave background (CMB) observables
can distinguish this case from inflation with chi^2 potential, provided that
the initial value of the late-decaying sneutrino is either an order of
magnitude smaller or larger than the reduced Planck scale.
