On the Observability of "Invisible" / "Nearly Invisible" Charginos
Abstract
It is shown that if the charginos decay into very soft leptons or hadrons + E due to degeneracy/ near- degeneracy with the LSP or the sneutrino, the observability of the recently proposed signal via the single photon (+ soft particles) + E channel crucially depends on the magnitude of the mass due to destructive interferences in the matrix element squared. If the 's and, consequently, left-sleptons are relatively light, the size of the signal, previously computed in the limit ∞ only, is drastically reduced. We present the formula for the signal cross section in a model independent way and discuss the observability of the signal at LEP 192 and NLC energies.
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