Abstract
Neutralino as the lightest supersymmetric particle (LSP) is a candidate for supersymmetric dark matter. It is known that coannihilation effects could be important in neutralino relic density calculation. Here we present some results on neutralino-stop coannihilation in the CMSSM. In this model, the stop t ̃ 1 can be degenerate with the lightest neutralino χ when | A 0| ≠ 0 and large, more specifically when the lighter stop mass is suppressed by large off diagonal terms in the stop square mass matrix. In the region where t ̃ 1 is slightly heavier than χ, the coannihilation effect brings the relic density into the range favored by cosmology. While the χ − t ̃ 1 coannihilation channels do not increase the range of m χ , they do extend the cosmologically preferred region to larger values of m 0.
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