Determination of MSSM Parameters from LHC and ILC Observables in a Global Fit

Abstract

We present the results of a realistic global fit of the Lagrangian parameters of the Minimal Supersymmetric Standard Model assuming universality for the first and second generation and real parameters. No assumptions on the SUSY breaking mechanism are made. The fit is performed using the precision of future mass measurements of superpartners at the LHC and mass and polarized topological cross-section measurements at the ILC. Higher order radiative corrections are accounted for whereever possible to date. Results are obtained for a modified SPS1a MSSM benchmark scenario but they were checked not to depend critically on this assumption. Exploiting a simulated annealing algorithm, a stable result is obtained without any a priori assumptions on the values of the fit parameters. Most of the Lagrangian parameters can be extracted at the percent level or better if theoretical uncertainties are neglected. Neither LHC nor ILC measurements alone will be sufficient to obtain a stable result. The effects of theoretical uncertainties arising from unknown higher-order corrections and parametric uncertainties are examined qualitatively. They appear to be relevant and the result motivates further precision calculations. The obtained parameters at the electroweak scale are used for a fit of the parameters at high energy scales within the bottom-up approach. In this way regularities at these scales are explored and the underlying model can be determined with hardly any theoretical bias. Fits of high-scale parameters to combined LHC+ILC measurements within the mSUGRA framework reveal that even tiny distortions in the low-energy mass spectrum already lead to inacceptable chi^2 values. This does not hold for ``LHC only'' inputs.

arXiv comment25 pages, 5 figures

References in corpus (15)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A complete analysis of FCNC and CP constraints in general SUSY extensions of the standard model
• SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+ e- colliders
• Precision Corrections in the Minimal Supersymmetric Standard Model
• Two-Loop Renormalization Group Equations for Soft Supersymmetry-Breaking Couplings
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Extracting Higgs boson couplings from LHC data
• On the neutral Higgs boson masses in the MSSM for arbitrary stop mixing
• Analysis of the Neutralino System in Supersymmetric Theories
• Reconstructing the Chargino System at $e^{+}{e}^{-}$ Linear Colliders
• WMAP constraints on SUGRA models with non-universal gaugino masses and prospects for direct detection
• The Reconstruction of Supersymmetric Theories at High Energy Scales
• Fittino, a program for determining MSSM parameters from collider observables using an iterative method
• SUSY--QCD corrections to scalar quark pair production in $e^{+}{e}^{-}$ annihilation
• One-loop calculations for SUSY processes

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