2010/07/31 by Ivan Donkin, Arthur Hebecker
Physics and Astronomy · #Black Holes and Theoretical Physics #Coupling (piping) #Gauge (firearms) #Higgs boson #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Renormalization #Renormalization group #Scale (ratio) #Supersymmetry #Theoretical physics #Yukawa potential #hep-ph #hep-th
paper · pdf · doi:10.1007/jhep09(2010)044
published as JHEP 1009:044,2010 · 26 pages, LaTeX. v6: Important early reference added
openalex publication_date 2010/09/01 · arxiv created 2012/08/09 · arxiv updated 2012/08/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the impact of extra vector-like GUT multiplets on the predicted value of the strong coupling. We find in particular that Yukawa couplings between such extra multiplets and the MSSM Higgs doublets can resolve the familiar two-loop discrepancy between the SUSY GUT prediction and the measured value of alpha3. Our analysis highlights the advantages of the holomorphic scheme, where the perturbative running of gauge couplings is saturated at one loop and further corrections are conveniently described in terms of wavefunction renormalization factors. If the gauge couplings as well as the extra Yukawas are of O(1) at the unification scale, the relevant two-loop correction can be obtained analytically. However, the effect persists also in the weakly-coupled domain, where possible non-perturbative corrections at the GUT scale are under better control.