Light Scalar Top Quarks and Supersymmetric Dark Matter

Abstract

A stable neutralino ${\chi }_1^0$, assumed to be the lightest supersymmetric particle, is a favored particle physics candidate for the cosmological Dark Matter. We study co-annihilation of the lightest neutralino with the lighter scalar top quark ${\tilde{t}}_1$. We show that for natural values of the neutralino mass, $\lsim 300$ GeV, the ${\chi }_1^0-{\tilde{t}}_1$ mass difference has to exceed $\sim 10$ to 30 GeV if ${\chi }_1^0$, is to contribute significantly to the Dark Matter. Scenarios with smaller mass splitting, where ${\tilde{t}}_1$ is quite difficult to detect at collider experiments, are thus cosmologically disfavored. On the other hand, for small ${\tilde{t}}_1-{\chi }_1^0$ mass splitting, we show that co--annihilation allows very large neutralino masses, $m_{{\chi }_1^0}\sim 5$ TeV, without ``overclosing'' the Universe.

arXiv commentLatex, 8 pages, 2 figures

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