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Phenomenological Indications of the Scale of Supersymmetry

J. Ellis·S. Heinemeyer·K. A. Olive·G. Weiglein
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Abstract

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 the new experimental top-quark mass, m_t = 172.7 \pm 2.9 GeV, within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which there are three independent soft supersymmetry-breaking parameters m_{1/2}, m_0 and A_0. In addition to M_W and sin^2 theta_eff, the analysis is based on (g-2)_μ, BR(b -> s gamma) and the lightest MSSM Higgs boson mass, M_h. Assuming initially that the lightest supersymmetric particle (LSP) is a neutralino, we display the CMSSM results as functions of m_{1/2}, fixing m_0 so as to obtain the cold dark matter density allowed by WMAP and other cosmological data for specific values of A_0, tan_beta and mu > 0. For a sample value of tan_beta we analyze how the global chi^2 function would change following a possible future evolution of the experimental central value of m_t 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 mu and the pseudoscalar Higgs mass M_A become additional free parameters compared to the CMSSM, a VCMSSM in which the bilinear soft supersymmetry breaking parameter B_0 = A_0 - m_0, 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.

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J. Ellis, S. Heinemeyer, K. A. Olive, G. Weiglein. 2006-04-18. Phenomenological Indications of the Scale of Supersymmetry. https://doi.org/10.1088/1126-6708%2F2006%2F05%2F005

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