FCNC in the 3-3-1 model with right-handed neutrinos

TL;DR

This paper investigates flavor changing neutral currents in a 3-3-1 model with right-handed neutrinos, highlighting how new gauge bosons and quark mixing affect rare top decays and experimental constraints.

Contribution

It provides a detailed analysis of FCNC sources in the 3-3-1 model with right-handed neutrinos and establishes bounds on quark mixing and gauge boson masses based on experimental data.

Findings

Large rates of rare top decays are possible if |V_tb|<1.

The model is consistent with current limits if the new gauge boson mass exceeds 10 TeV.

Identifies new sources of flavor changing neutral currents in the model.

Abstract

Flavor changing neutral currents coming from a new non-universal neutral Gauge-Boson and from the non-unitary quark mixing matrix for the $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ model with right handed neutrinos are studied. By imposing as experimental constraints the measured values of the 3x3 quark mixing matrix, the neutral meson mixing, and the bounds measured values for direct flavor changing neutral current processes, the largest mixing of the known quarks with the exotic ones can be established, with new sources of flavor changing neutral currents being identified. Our main result is that for a $|V_{tb}|$ value smaller than one, large rates of rare top decays such as $t\to c\gamma$, $t\to cZ$, and $t\to cg$ (where g stands for the gluon field) are obtained; but if $|V_{tb}|\approx 1$ the model can survive present experimental limits only if the mass of the new neutral Gauge Boson becomes larger that 10 TeV.