The supersymmetric parameter space in light of B-physics observables and electroweak precision data

John Ellis, Sven Heinemeyer, Keith A. Olive, Arne M. Weber, Georg Weiglein

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60 Scopus citations


Indirect information about the possible scale of supersymmetry (SUSY) breaking is provided by B-physics observables (BPO) as well as electroweak precision observables (EWPO). We combine the constraints imposed by recent measurements of the BPO BR(b → sγ), BR(Bs → μ+μ-), BR(Bu → τν τ) and ΔMBs with those obtained from the experimental measurements of the EWPO MW, sin2θ eff, ΓZ, (g - 2)μ and Mh, incorporating the latest theoretical calculations of these observables within the Standard Model and supersymmetric extensions. We perform a x2 fit to the parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which the SUSY-breaking parameters are universal at the GUT scale, and the non-universal Higgs model (NUHM), in which this constraint is relaxed for the soft SUSY-breaking contributions to the Higgs masses. Assuming that the lightest supersymmetric particle (LSP) provides the cold dark matter density preferred by WMAP and other cosmological data, we scan over the remaining parameter space. Within the CMSSM, we confirm the preference found previously for a relatively low SUSY-breaking scale, though there is some slight tension between the EWPO and the BPO. In studies of some specific NUHM scenarios compatible with the cold dark matter constraint we investigate (M A, tanβ) planes and find preferred regions that have values of x2 somewhat lower than in the CMSSM.

Original languageEnglish (US)
JournalJournal of High Energy Physics
Issue number8
StatePublished - Aug 1 2007


  • B-physics
  • Higgs physics
  • Supersymmetric standard model
  • Supersymmetry phenomenology


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