Abstract
Superheavy particles near the unification threshold introduce modifications to precise grand-unified-theory (GUT) predictions. We establish a very useful and general theorem valid in a class of models possessing the custodial symmetry SU(2${)}_{\mathit{L}}$\ifmmode\times\else\texttimes\fi{}SU(2${)}_{\mathit{R}}$\ifmmode\times\else\texttimes\fi{}SU(4${)}_{\mathit{C}}$\ifmmode\times\else\texttimes\fi{}P at the highest intermediate scale, according to which the one-loop GUT-threshold contribution to ${\mathrm{sin}}^{2}$${\mathrm{\ensuremath{\theta}}}_{\mathit{W}}$ by every class of superheavy particles (gauge bosons, Higgs scalars, and additional fermions) vanishes. The result also applies with supersymmetry, infinite towers, or higher-dimensional operators, and is independent of other intermediate symmetries at lower scales.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
