Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-19
Phys.Rev.D71:066004,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
46 pages, 4 figures, LaTeX, version as to appear in Physical Review D
Scientific paper
10.1103/PhysRevD.71.066004
Five-dimensional field theories compactified on an S^1/Z_2 orbifold naturally include local brane kinetic terms at the orbifold fixed points at the tree as well as the quantum level. We study the quantization of these theories before the Kaluza--Klein reduction and derive the relevant Ward and Slavnov-Taylor identities that result from the underlying gauge and Becchi-Rouet-Stora symmetries of the theory. With the help of these identities, we obtain a generalization of the equivalence theorem, where the known high-energy equivalence relation between the longitudinal Kaluza-Klein gauge modes and their respective would-be Goldstone bosons is extended to consistently include the energetically suppressed terms in the high-energy scatterings. Demanding perturbative unitarity, we compute upper limits on the number of the Kaluza-Klein modes. We find that these limits weakly depend on the size of the brane kinetic terms.
Mück Alexander
Nilse Lars
Pilaftsis Apostolos
Rückl Reinhold
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