Matching the low- and high-energy determinations of α<inf>s</inf>(M<inf>Z</inf>) in the MSSM

David Garcia, Joan Solà

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44 Citations (Scopus)


Recent calculations of supersymmetric corrections to the conflicting ratios Rb and Rc have shown that an alleged discrepancy between the SM predictions of these observables and the corresponding experimental values can be cured in the MSSM within a certain region of the parameter space. Here we show that, in this very same region, also a well-known discrepancy between the low- and high-energy determinations of αs(MZ) can be disposed of. Specifically, we find that the lineshape determination of the strong coupling constant, which in the SM points towards the large central value αs(MZ) ≳ 0.125, can be matched up with the value suggested by the wealth of low-energy data, namely αs(MZ) {reversed tilde equals} 0.11, which is smaller and more in line with the traditional QCD expectations at low energy. Our approach differs from previous analyses in that we argue that the desired matching could originate to a large extent from a purely electroweak supersymmetric quantum effect. © 1995.
Original languageEnglish
Pages (from-to)349-358
JournalPhysics Letters B
Issue number3
Publication statusPublished - 7 Sep 1995


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