A 331 Model for Lepton Flavor Universality Violation in $B$ Decays

Lepton Flavor Universality Violation (LFUV) in $B$ decays in both neutral $b\to s{l}^{+}{l}^{-}$ and charged $b\to cl{\bar{\nu }}_l$ processes observed in the ratios $R_{K^{(\ast )}}$ and $R_{D^{(\ast )}}$ is investigated in the framework of a model based on the extended symmetry gauge $SU(3){C}\otimes SU(3){L}\otimes U(1)_{X}$ whose leptonic sector consists of five triplets. It is shown that in order to explain the experimentally observed deviations from the Standard Model in these flavor changing transitions, a non-minimal version of the model has to be considered. We investigate the ability of this model in accommodating the model-independent scenarios currently favored by global fits.