Abstract
We show that the solid lower bound of about 10−44 cm2 is obtained for the cross section between the supersymmetric dark matter and nucleon in a theory in which the supersymmetric fine-tuning problem is solved without extending the Higgs sector at the weak scale. This bound arises because of relatively small superparticle masses and a fortunate correlation that the two dominant diagrams for the dark matter detection always interfere constructively if the constraint from the b→sγ measurements is obeyed. It is, therefore, quite promising in the present scenario that the supersymmetric dark matter is discovered before the LHC, assuming that the dark matter is the lightest supersymmetric particle.
Highlights
Weak scale supersymmetry provides an elegant framework to address the naturalness problem of the standard model as well as to provide the dark matter of the universe
We have shown that the supersymmetric fine-tuning problem can be solved within the framework of the minimal supersymmetric standard model (MSSM) [2]
A one-loop correction from the top-stop loop to the Higgs mass-squared parameter is made small by effectively lowering the messenger scale of supersymmetry breaking [3, 4], by invoking a mixture of moduli [5] and anomaly mediated [6] contributions as a source of supersymmetry breaking [7]
Summary
We find that in the parameter region relevant to our solution to the fine-tuning problem, the cross sections between the Higgsino and nuclei are dominated by the t-channel Higgs boson exchange diagrams. We find that the parameter region relevant for the solution to the fine-tuning problem gives the dark matter-nucleon spin-independent cross section ranging from about 10−44 cm2 to several times
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