Probing Models with Near Degeneracy of the Chargino and LSP at a Linear e+e- Collider

Abstract

For some choices of soft SUSY--breaking parameters, the LSP is a stable neutralino, the NLSP is a chargino almost degenerate in mass with the LSP (with mass difference $\sim m_{\pi}-$few GeV), and all other sparticles are relatively heavy. We discuss the potential of a \sqrt{s}\sim 600\gev $e^+e^-$ collider for studying such models.Comment: 37 pages, 13 figures; revised version includes additional reference