1999/05/31 by Zurab Kakushadze, Tomasz R. Taylor · 39 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Context (archaeology) #Coupling (piping) #Gauge (firearms) #Gauge theory #Loop (graph theory) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Renormalization #String (physics) #Unification #hep-ph #hep-th
paper · pdf · doi:10.1016/s0550-3213(99)00517-9
published in Nuclear Physics B 562(1-2), 78-102 (Elsevier BV) · 27 pages, revtex; minor misprints corrected, some comments modified (to appear in Nucl. Phys. B)
arxiv created 1999/09/08 · openalex publication_date 1999/11/01 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss higher loop corrections to gauge coupling renormalization in the context of gauge coupling unification via Kaluza-Klein thresholds. We show that in the case N=1 supersymmetric compactifications the one-loop threshold contributions are dominant, while the higher loop correction are subleading. This is due to the fact that at heavy Kaluza-Klein levels the spectrum as well as the interactions are N=2 supersymmetric. In particular, we give two different arguments leading to this result - one is field theoretic, while the second one utilizes the power of string perturbation techniques. To illustrate our discussions we perform explicit two-loop computations of various corrections to gauge couplings within this framework. We also remark on phenomenological applications of our discussions in the context of TeV-scale brane world.