Novel sources of Flavor Changed Neutral Currents in the $331_{RHN}$ model

TL;DR

This paper investigates new sources of flavor-changing neutral currents in the 3-3-1 model with right-handed neutrinos, highlighting scalar contributions and deriving stronger constraints from meson systems.

Contribution

It identifies novel scalar-mediated FCNC sources in the 331_{RHN} model and derives enhanced bounds from meson mixing data.

Findings

Scalar contributions to FCNC are significant in the model.

Stronger bounds on model parameters from meson systems.

New interactions can tighten existing constraints.

Abstract

Sources of Flavor Changed Neutral Currents (FCNC) naturally emerge from a well motivated framework called 3-3-1 with right-handed neutrinos model, $331_{RHN}$ for short, mediated by an extra neutral gauge boson $Z^{\prime}$. Following previous works we calculate these sources and in addition we derive new ones coming from CP-even and -odd neutral scalars which appear due to their non-diagonal interactions with the physical standard quarks. Furthermore we show that bounds related to the neutral mesons systems $K_L-K_S$ and $D_1^0 - D_2^0$ may be significantly strengthened in the presence of these new interactions allowing us to infer stronger constraints on the parameter space of the model.