Polychromatic Grand Unification [article]

G.C. Branco, J.-M. Gerard, R. Gonzalez Felipe, B.M. Nobre
2003 arXiv   pre-print
The possibility of achieving a gauge coupling grand unification by increasing the QCD degrees of freedom at higher energies is investigated. When confronted with precision low-energy data, the generic weak-mixing angle relation sin^2(theta_W) = N/2(N+1) requires N=7 colors at the GUT scale M_U ~ 10^17 GeV. With the exclusive addition of light Higgs doublets to the standard model particle content, such a unification may also occur if N=5 at M_U ~ 10^16 GeV.
arXiv:hep-ph/0305092v1 fatcat:b6sltt45t5e2rhnt3ttjdinrc4