TESTING GAUGE-GRAVITINO COUPLING IN GAUGE-MEDIATED SUPERSYMMETRY BREAKING THROUGH SINGLE-PHOTON EVENTS

We show that the process e(+)e(-) --> gamma+ missing energy, arising f rom the pair production of neutralinos, can probe the gamma-<(gamma)ov er tilde>-(G) over tilde as well as the Z-(Z) over tilde-(G) over tild e couplings in Gauge Mediated Supersymmetry Breaking models. This enab les one to study the mutual relationship of the Goldstino couplings of the different gauginos, a feature whose testability has not been emph asized so far, The Standard Model backgrounds get supposed with the us e of a right polarized electron beam. The energy and angular distribut ion of the emitted photon can distinguish such models from the minimal supersymmetric theory and its variants. (C) 1998 Elsevier Science B.V .