Flavor changing Flavon decay $\varphi \to tc$ ($\varphi =H_F,A_F$) at the High Luminosity Large Hadron Collider

Abstract

We present a study of the flavor changing decays $\varphi \to tc$ ($\varphi =H_F,A_F$) of the $CP$-even and $CP$-odd scalar flavons at the large hadron collider and its next stage, the high-luminosity large hadron collider. The theoretical framework is an extension of the standard model that incorporates an extra complex singlet and invokes the Froggatt-Nielsen mechanism with an Abelian flavor symmetry. The projected exclusion and discovery regions in terms of the model parameters are reported. We find that $A_F$ could be detected at the LHC by considering a reasonable scenario of the model parameter space. As far as $H_F$ is concerned, we also found promising results that could be verified experimentally at the high-luminosity LHC.

Comments: Substantial changes to the previous version