Starting with a manifestly conformal (O(d,2) invariant) mechanics model in
d space and 2 time dimensions, we derive the action for a massless spinning
particle in d-dimensional anti-de Sitter space. The action obtained possesses
both gauge N-extended worldline supersymmetry and local O(N) invarince.
Thus we improve the old statement by Howe et al. that the spinning particle
model with extended worldline supersymmetry admits only flat space-time
background for N>2 (spin greater one). The original (d+2)-dimensional
model is characterized by rather unusual property that the corresponding
supersymmetry transformations do not commute with the conformal ones, in spite
of the explicit O(d,2) invariance of the action.Comment: 13 pages, LaTe