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We have studied the magnetoresistance of (001)Fe/(001)Cr superlattices prepared by molecularbeam epitaxy. A huge magnetoresistance is found in superlattices with thin Cr layers: For example, with rc, =9 A, at T =4.2 K, the resistivity is lowered by almost a factor of 2 in a magnetic field of 2 T. We ascribe this giant magnetoresistance to spin-dependent transmission of the conduction electrons ...
We present an overview of searches for MSSM Higgs at the Tevatron, concentrating on searches probing the high tanβ region. We discuss the search for A/H → ττ which is soon to be completed in the Run I data and review the new tau triggers implemented by CDF and D0 in Run II, which will greatly impact this analysis. We also present the results of a Run I search for A/Hbb→ bbbb performed by CDF an...
We study a subset of electroweak-precision observables consisting of MW , sin 2 θ eff, BR(Z → τ τ) and Γ(Z → ττ)/Γ(Z → ee)− 1 (characterizing leptonic Z-decays) in the context of the NMSSM. After a brief review of common MSSM-NMSSM effects (e.g. for Γ(Z → ττ)/Γ(Z → ee)− 1, which has been little discussed, even in the MSSM), specific NMSSM scenarios are studied, with the result that the NMSSM, c...
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