Flipped SU(6) Unification of the $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ Model

Abstract

We propose to partially unify the sequential $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ model (with $\beta =1/\sqrt{3}$) into the flipped $SU(6)$ model with the gauge group $SU(6)\times U(1{)}_K$. Gauge anomaly cancellation can easily be satisfied. We discuss the relevant Higgs sector, the low energy $331$ model spectrum and the unification of $SU(3{)}_c$ and $SU(3{)}_L$ gauge couplings. Neutrino masses generation and successful gauge coupling unification can set lower/upper bounds on the $331$ breaking scale. The partial proton decay lifetime of various channels, for example, the $p\to e^{+}{\pi }^0$ channel, in flipped SU(6) GUT are discussed. We find that certain parameter region with $M_{331}\sim 10^{15}$ GeV of case II (for case with $M_{331}$ scale ${\tilde{\mathbf{H}}}_{3,8}$ Higgs field) can predict a partial proton lifetime of order $10^{34}$ years for $p\to e^{+}{\pi }^0$ mode, which can be tested soon by future DUNE and Hyper-Kamiokande experiments.

arXiv comment23 pages, 1 figure and 2 tables; Discussions added, submitted version

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