Electroweak precision observables in the minimal supersymmetric standard model

Abstract

The current status of electroweak precision observables in the Minimal Supersymmetric Standard Model (MSSM) is reviewed. We focus in particular on the W boson mass, M W , the effective leptonic weak mixing angle, sin 2 θ eff , the anomalous magnetic moment of the muon, (g − 2) µ , and the lightest CP-even MSSM Higgs boson mass, m h . We summarize the current experimental situation and the status of the theoretical evaluations. An estimate of the current theoretical uncertainties from unknown higher-order corrections and from the experimental errors of the input parameters is given. We discuss future prospects for both the experimental accuracies and the precision of the theoretical predictions. Confronting the precision data with the theory predictions within the unconstrained MSSM and within specific SUSY-breaking scenarios, we analyse how well the data are described by the theory. The mSUGRA scenario with cosmological constraints yields a very good fit to the data, showing a clear preference for a relatively light mass scale of the SUSY particles. The constraints on the parameter space from the precision data is discussed, and it is shown that the prospective accuracy at the next generation of colliders will enhance the sensitivity of the precision tests very significantly. * email: Sven.Heinemeyer@cern.ch †

Precise prediction forMWin the MSSM

“…We have checked that for real parameters our new result agrees with the previously most advanced implementation [3] typically within about 5 MeV.…”

“…This region is characterized by a relatively small fermionic mass parameter, m 1/2 , while the common scalar mass parameter m 0 is very large, and also tan β is relatively large. 3 We now investigate whether it is also possible to obtain a prediction for M W that is in better agreement with the experimental value than the SM prediction if the MSSM parameters are restricted to the focus point region.…”

“…The physical masses are denoted as mχ0 1,2,3,4 and are obtained in a diagonalisation procedure using the matrix Nχ0.…”

Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

“…The result Eq. (28) disagrees at the three-σ level with the value determined in global precision electroweak fits, such as [57,58] sin 2 θ W EWfit = 0.2223 ± 0.0003 .…”

The road towards the international linear collider: Higgs, top/quantum chromodynamics, loops

“…the SM, or the MSSM, for a recent overview see Ref. [37]). The status of the field of loop calculations (including the presentations at the LCWS06) is briefly summarized in Fig.…”