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T: Teilchenphysik

T 104: Neue Ph
änomene I

T 104.1: Vortrag

Montag, 18. März 2002, 14:00–14:15, HS 9

Minimal Higher-Dimensional Extensions of the Standard Model and Electroweak Observables — •Alexander Mück¹, Apostolos Pilaftsis², and Reinhold Rückl¹ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg — ²Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL

We consider minimal 5-dimensional extensions of the Standard Model compactified on an S¹/Z₂ orbifold, in which the SU(2)_L and U(1)_Y gauge fields and Higgs bosons may or may not all propagate in the fifth dimension while the observable matter is always assumed to be confined to a 4-dimensional subspace. Based on recent data from electroweak precision tests, we improve previous limits obtained in the 5-dimensional Standard Model with a common compactification radius and extend our analysis to other possible 5-dimensional Standard-Model constructions. We find that the usually derived lower bound of ∼ 4 TeV on an universal compactification scale may be considerably relaxed to ∼ 3 TeV in a minimal scenario, in which the SU(2)_L gauge boson is the only field that feels the presence of the fifth dimension.