Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-02-02
Phys.Rev. D63 (2001) 125014
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 5 figures, revtex and axodraw
Scientific paper
10.1103/PhysRevD.63.125014
We study in detail the issue of gauge-fixing in theories with one universal extra dimension, i.e. theories where both bosons and fermions display Kaluza-Klein (KK) excitations. The extra dimension is compactified using the standard orbifold construction for a massless chiral fermion. We carry out the gauge-fixing procedure at the level of the five-dimensional theory and determine the tree-level propagators and interaction vertices needed for performing perturbative calculations with the effective four-dimensional theory resulting after the compactification. The gauge-independence of the tree-level S-matrix involving massive KK modes is verified using specific examples. In order to obtain massive fermionic zero modes one has to enlarge the theory by introducing a set of mirror fermions, a construction which is carried out in detail. Finally, the gauge-independence of the tree-level S-matrix involving the resulting new mass-eigenstates is proved by resorting to generalized current conservation equations.
Papavassiliou Joannis
Santamaria Arcadi
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