2003/04/23 by Xiao-Gang He, X. -G. He, G. Valencia · 1 citation
Mathematics · Physics and Astronomy · #Algorithm #Archaeology #Black Holes and Theoretical Physics #Boson #Combinatorics #Computer science #Context (archaeology) #Gauge boson #Gauge theory #History #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Prime (order theory) #Quantum Chromodynamics and Particle Interactions #Tree (set theory) #hep-ph
paper · pdf · doi:10.1103/physrevd.68.033011
published as Phys.Rev. D68 (2003) 033011 · Revtex 28 pages, 10 figure
arxiv created 2003/04/23 · openalex publication_date 2003/08/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We explore models with additional right-handed gauge bosons that couple predominantly to the third generation in the context of bb production at CERN LEP. In particular we investigate potential new contributions to \ensuremathδgRb that are needed if the measured AFBb at the Z peak is interpreted as a signal of new physics. We identify two sources of large \ensuremathδgRb corrections: Z\ensuremath-Z^\ensuremath' mixing at the tree level, and one-loop effects from a new SUR(2) triplet of gauge bosons. We find that the latter can contribute to \ensuremathδgRb at the 1% level. We place bounds on the mass of the additional Z^\ensuremath' gauge boson that occurs in these models using the Rb measurements from LEP-II. We find that even in cases where the Z^\ensuremath' couples almost exclusively to the b and t quarks, masses lighter than about 500 GeV are already excluded.