The physics of a new gauge boson in a Stueckelberg extension of the two-Higgs-doublet model

TL;DR

This paper explores a Stueckelberg extension of the two-Higgs-doublet model inspired by string theory, highlighting unique decay properties of a new gauge boson and charged Higgs boson decay channels.

Contribution

It introduces a novel Stueckelberg extension incorporating string-inspired features into the two-Higgs-doublet model, emphasizing distinctive decay behaviors.

Findings

Heavy gauge boson has a sharp decay width.

Charged Higgs boson exhibits two main decay channels with equal branching ratios.

Abstract

String theory constructions using D-brane physics offer a framework where ingredients like extra abelian factors in the gauge group, more than one Higgs doublet and a generalized Green-Schwarz mechanism appear at the same time. Motivated by works towards the direction of obtaining the Standard Model in orientifold constructions, we study in the present work a Stueckelberg extension of the two-Higgs-doublet model. The distinctive features of our model are i) a sharp decay width for the heavy gauge boson, and ii) a charged Higgs boson having two main decay channels at tree level with equal branching ratios.