Frugal U(1)X models with non-minimal flavor violation for b → sll anomalies and neutrino mixing

We analyze the class of models with an extra U(1)(X) gauge symmetry that can account for the b -> sll anomalies by modifying the Wilson coefficients C-9e and C-9 mu of the operators O-9l ((b) over bar gamma(mu)P(L)s)((l) over bar gamma(mu)l) from their standard model values. At the same time, these models generate appropriate quark mixing, and give rise to neutrino mixing via the Type-I seesaw mechanism. Apart from the gauge boson Z', these frugal models only have three right-handed neutrinos for the seesaw mechanism, an additional SU(2)(L) scalar doublet for quark mixing, and a SM-singlet scalar that breaks the U(1)(X) symmetry. This set-up identifies a class of leptonic symmetries, and necessitates non-zero but equal charges for the first two quark generations. If the quark mixing beyond the standard model were CKM-like, all these symmetries would be ruled out by the latest flavor constraints on Wilson coefficients and collider constraints on Z' parameters. However, we identify a single-parameter source of non-minimal flavor violation that allows a wider class of U(1)(X) symmetries to be compatible with all data. We show that the viable leptonic symmetries have to be of the form L-e +/- 3L(mu) - L-tau or L-e - 3L(mu) + L-tau, and determine the (M-Z',M-gZ') parameter space that may be probed by the high-luminosity data at the LHC.

Automated summary

We analyze a class of models with an extra U(1)(X) gauge symmetry that explain the b -> sll anomalies and generate appropriate quark and neutrino mixing. These models, with specific constraints and parameter space, are consistent with the latest experimental data.