Muon anomalous magnetic moment in supersymmetric scenarios with an intermediate scale and nonuniversality

Abstract

We analyze the anomalous magnetic moment of the muon (a_μ) in supersymmetric scenarios. First we concentrate on scenarios with universal soft terms. We find that a moderate increase of a_μ can be obtained by lowering the unification scale M_{GUT} to intermediate values 10^{10-12} GeV. However, large values of \tan βare still favored. Then we study the case of non-universal soft terms. For the usual value M_{GUT}~10^{16} GeV, we obtain a_μ in the favored experimental range even for moderate \tan βregions \tanβ~ 5$. Finally, we give an explicit example of these scenarios. In particular, we show that in a D-brane model, where the string scale is naturally of order 10^{10-12} GeV and the soft terms are non universal, a_μ is enhanced with low \tanβ.

Final version to appear in Phys. Rev. D. Conventions clarified, results in the figures improved

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