Some Signals for a Light Neutralino

Abstract

If a light gaugino sector exists in the supersymmetric standard model then the mass of lightest neutralino may be of the order of 1 GeV or less. As a consequence of neutral flavor violation in supersymmetric theories $B_s$-meson may decay into a pair of lightest neutralinos in such a case. It is found that the parameter space for such light neutralinos can be appreciably constrained by looking for such decays. We also show how a rare B-decays ($B⟶K(K^{\ast })+invisible$ channels) can help us in probing a light neutralino in B-factories in a reasonably model- independent manner. Finally, we observe that that the decay of a tau-lepton into a muon and a pair of light neutralinos can cause a violation of weak universality which is larger in magnitude than that from any source known so far.

Comments: LaTex File, 6 Pages, Two Figures (available from authors by request). Presented at the International Workshops on Particle Theory and Phenomenology, IITAP, Iowa State University, USA, May 17-26, 1995