SUPERSYMMETRIC SIGNALS IN ELECTRON PHOTON COLLISIONS

Associated selectron-neutralino production in the process e- gamma --> e- chi0 provides a striking supersymmetric signal: events with a single high-p(perpendicular-to) electron and otherwise only invisible particles. For e- gamma collisions obtained at high-energy linear colliders through back-scattering of a laser beam, this reaction is shown to be complementary to selectron pair production in the processes e+ e- --> e+ e- and e- e- --> e- e-, and to be a probe of heavy selectrons beyond the kinematical limit of pair production. The standard model background from e- gamma --> e- Z0 and W- nu is studied and substantially reduced by rapidity and transverse momentum cuts. The minimum required integrated luminosities for observing this supersymmetric signal are given as functions of several model parameters and collider energies.