EXPERIMENTAL CONSEQUENCES OF NO-SCALE SUPERGRAVITY IN LIGHT OF THE CDF EE-GAMMA-GAMMA EVENT

We explore two possible interpretations for the CDF ee gamma gamma+L-T event in the context of a recently proposed no-scale supergravity mod el with a light gravitino. We delineate the region in parameter space consistent with the kinematics of the event interpreted either as sele ctron pair production (<p(p)over bar>--><(e)over tilde(+)><(e)over til de(-)> X, (e) over tilde=<(e)over tilde(R)>, <(e) over tilde(L)>) or a s chargino pair production (<p(p)over bar>-->chi(1)(+)chi(1)(-)X). In the context of this model, the selectron interpretation requires (e) o ver tilde=<(e)over tilde(R)> and predicts comparable rates for L(+/-)g amma gamma+E-T, whereas the chargino interpretation predicts comparabl e rates for (l(+/-)l'(+)l'(-),l(+)l(-),l(+)l(-)jj)gamma gamma+E-T. We also consider the constraints from CERN LEP 1.5 and the expectations f or LEP 2. We point out that one of the acoplanar photon pairs observed by the OPAL Collaboration at LEP 1.5 may be attributable to supersymm etry in the present model via e(+)e(-)-->chi(1)(0) chi(0)(1)-->gamma g amma+E-T. We also show how similar future events at LEP 2 may be used to deduce the neutralino mass.