Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-30
Phys.Rev.D65:085037,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
48 pages, LaTeX, 1 eps figure, typos corrected
Scientific paper
10.1103/PhysRevD.65.085037
We consider minimal 5-dimensional extensions of the Standard Model compactified on an $S^1/Z_2$ 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. We pay particular attention to consistently quantize the higher-dimensional models in the generalized $R_\xi$ gauge and derive analytic expressions for the mass spectrum of the resulting Kaluza-Klein states and their couplings to matter. 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 $\sim 4$ TeV on an universal compactification scale may be considerably relaxed to $\sim 3$ 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.
Mück Alexander
Pilaftsis Apostolos
Rückl Reinhold
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