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An analysis of the sensitivity of supersymmetric dark matter to variations inthe b quark mass is given. Specifically we study the effects on the neutralinorelic abundance from supersymmetric loop corrections to the mass of the bquark. It is known that these loop corrections can become significant for large$\tan\beta$. The analysis is carried out in the framework of mSUGRA and wefocus on the region where the relic density constraints are satisfied byresonant annihilation through the s-channel Higgs poles. We extend the analysisto include CP phases taking into account the mixing of the CP-even and CP-oddHiggs boson states which play an important role in determining the relicdensity. Implications of the analysis for the neutralino relic densityconsistent with the recent WMAP relic density constraints are discussed.Comment: 28 pages, 12 figure

Sensitivity of supersymmetric dark matter to thebquark mass