Minimal SU(5) Resuscitated by Long-Lived Quarks and Leptons
High Energy Physics - Phenomenology
2009-10-30 v1
Abstract
The issue of gauge unification in the (non-supersymmetric) Standard Model is reinvestigated. It is found that with just an additional fourth generation of non-sequential and long-lived quarks and leptons, SU(3)xSU(2)xU(1) gauge couplings converge to a common point of approximately 3.5x10^{15} GeV (corresponding to a proton lifetime of approximately 10^{34 plus/minus 1} years). This result is due to the non-negligible- but still perturbative- contributions of the top and fourth generation Yukawa couplings to the gauge two-loop beta functions, in contrast with the three generation case where such a contribution is too small to play an important role in unification.
Keywords
Cite
@article{arxiv.hep-ph/9712338,
title = {Minimal SU(5) Resuscitated by Long-Lived Quarks and Leptons},
author = {P. Q. Hung},
journal= {arXiv preprint arXiv:hep-ph/9712338},
year = {2009}
}
Comments
12 pages, 2 figures