Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-11
JHEP 0701:024,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 5 figures
Scientific paper
10.1088/1126-6708/2007/01/024
We study neutralino dark matter within a semi-realistic type I string model, where supersymmetry breaking arises from F-terms of moduli fields parameterised in terms of Goldstino angles, which automatically gives rise to non-universal soft third sfamily and gaugino masses. We study the fine-tuning sensitivities for dark matter and electroweak symmetry breaking across the parameter space of the type I string model, and compare the results to a similar analysis in the non-universal MSSM. Within the type I string model we find that neutralino dark matter can be naturally implemented in the $\stau$ bulk region, the $Z^0$ resonance region and the maximally tempered Bino/Wino/Higgsino region, in agreement with the results of the non-universal MSSM analysis. We also find that in the type I string model the ``well-tempered'' Bino/Wino region is less fine-tuned than in the MSSM, whereas the $\stau$ co-annihilation region exhibits a significantly higher degree of fine-tuning than in the MSSM.
King Stephen F.
Roberts J. P.
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