Electroweak precision measurements can provide indirect information about the possible scale of supersymmetry already at the present level of accuracy. We update the present-day sensitivities of precision data using mt = 172.7±2.9GeV for the experimental value of the top-quark mass, within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which there are three independent soft supersymmetrybreaking parameters m 1/2,m0 and A0. In addition to MW and sin2 θeff, the analysis is based on (g - 2)μ, BR(b → sγ) and the lightest MSSM Higgs boson mass, Mh. Assuming initially that the lightest supersymmetric particle (LSP) is a neutralino, we display the CMSSM results as functions of m1/2, fixing m0 so as to obtain the cold dark matter density allowed by WMAP and other cosmological data for specific values of A0, tan β and μ > 0. For a sample value of tan β we analyze how the global χ2 function would change following a possible future evolution of the experimental central value of mt and its error. In a second step, we extend the analysis to other constrained versions of the MSSM: the NUHM in which the soft supersymmetry-breaking contributions to the Higgs masses are independent and the Higgs mixing parameter μ and the pseudoscalar Higgs mass MA become additional free parameters compared to the CMSSM, a VCMSSM in which the bilinear soft supersymmetry breaking parameter B0 = A0 - m0, and the GDM in which the LSP is the gravitino. In all scenarios we find indications for relatively light soft supersymmetry-breaking masses, offering good prospects for the LHC and the ILC, and in some cases also for the Tevatron.
- Supergravity Models
- Supersymmetric Standard Model
- Supersymmetry Phenomenology