Predictions of Neutralino Dark Matter Event Rates in Minimal Supergravity Unification

Details Predictions of Neutralino Dark Matter Event Rates in Minimal Supergravity Unification Predictions of Neutralino Dark Matter Event Rates in Minimal Supergravity Unification

1995-09-09

arxiv.org/abs/hep-ph/9509260v2

Phys.Rev.D54:2374-2384,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version for easier TeXing, with some typos corrected. 25 pages + 12 figs.The figs can be faxed on request.

Scientific paper

10.1103/PhysRevD.54.2374

A detailed analysis of dark matter event rates in minimal supergravity models (MSGM) is given. It is shown analytically that the lightest neutralino the ${{\tilde {Z}_{1}}}$ is the LSP over almost all of the parameter space, and hence the natural candidate for cold dark matter (CDM). The radiative breaking of $SU(2)\times U(1)$ constraints are shown to be crucial in determining the expected event rates. Approximate analytic formulae are obtained to determine the gaugino-higgsino content of the ${{\tilde{Z}_{1}}}$ particle.From this one can deduce the behavior of the event rates as one varies the SUSY soft breaking parameters and tan $\beta$. The constraint on the event rates due to the recently measured $b\rightarrow s+\gamma$ decay is calculated. It is seen that this data eliminates most of the parameter space where $\mu$ (the Higgs mixing parameter) and $A_t$ (the t-quark cubic soft breaking parameter) have the same sign. Since the t-quark is close to its Landau pole, $A_t$ is restricted to be mostly positive, and so most of the $\mu>0$ part of the parameter space is eliminated...

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