Measuring the Spin of Invisible Massive Graviton Excitations at Future Linear Colliders

We consider the production process e(-)e(+) --> Ggamma of invisible gravitons (G) at future linear colliders. We discuss whether the angular distribution of the photon (gamma) can be used to measure the spin of the invisible graviton, or of any other invisible objects produced. We propose a method based on the Fourier expansion of the tra...More