Search for photinos in e +e − annihilation

Abstract

We discuss the pair production of massive photinos or other neutral gauginos in e +e − annihilation. We present cross sections for e +e − → γ γ γ including finite mass effects for both the selectron and the gaugino. Experimental signatures are a possible pair of photons from γ decay each with 〈E γ〉 = 1 4 E cm and a single soft photon in the case of radiative pair production. We exhibit the domains of selectron and gaugino masses and of the supersymmetry breaking scale parameter that could be probed by dedicated searches, pointinf out that the present PETRA and PEP centre-of-mass energies are nearly ideal for light gaugino hunts.