1997/02/28 by Gustavo Burdman, Dimitris Kominis · 3 citations
Physics and Astronomy · #Geology #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(97)00484-x
published as Phys.Lett. B403 (1997) 101-107 · 12 pages; uses LaTeX and psfig. Version to be published in Physics Letters B. Expanded discussion on top-pion and b-pion contributions, abridged discussion on vector mesons, change of Fig.2, one reference added. The full postscript version is also available at http://www.physik.tu-muenchen.de/tumphy/d/T30d/PAPERS/ TUM-HEP-267-97.ps.gz
arxiv created 1997/05/08 · openalex publication_date 1997/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We identify and compute the main corrections to Rb in Topcolor theories. They are due to the top-pions, the pseudo-Goldstone bosons associated with the chiral symmetry breaking responsible for the top quark mass, and amount to -(1-4)%, independent of the details of the Topcolor model. We show that the cancellation of this effect against the contributions from Topcolor vector and scalar resonances is unlikely, given the inherently distinct character of the two scales governing the potentially cancelling terms. The resulting value of Rb leads to severe constraints on Topcolor theories.