Probing the light charged Higgs boson, pseudoscalar Higgs boson, and $Z^\prime$ boson in the $U(1)_F$ model at the LHC

TL;DR

This paper investigates the production and decay of light charged Higgs, pseudoscalar Higgs, and $Z'$ bosons in a flavor-dependent $U(1)_F$ model at the LHC, highlighting a potential discovery of the charged Higgs near 130 GeV.

Contribution

It provides a detailed analysis of these particles within the $U(1)_F$ model, supporting the ATLAS excess and predicting high discovery potential for the charged Higgs at HL-LHC.

Findings

Charged Higgs near 130 GeV could be discovered at HL-LHC.

Pseudoscalar and $Z'$ bosons remain beyond current experimental reach.

Results support the ATLAS excess and B-anomaly compatibility.

Abstract

In this papar, we study the production and decay of a charged Higgs boson, a pseudoscalar Higgs boson, and a $Z'$ boson at the LHC within the flavor-dependent model (FDM), at the LHC. Considering the constraints from perturbative unitarity and experimental measurements (e.g., the flavor physics data, higgs signal strengths, electroweak precision observables), we investigate the relevant processes by analyzing several common LHC search channels. Motivated by the excess in $t \to b\bar{b}c$ reported by ATLAS, which suggests a charged Higgs boson with a mass near 130 GeV and consistent with B-anomaly expectations, we perform a dedicated simulation for a charged Higgs around this mass. Our results support the experimental hint and predict that this particle has a high discovery potential at the future High-Luminosity Large Hadron Collider (HL-LHC). In contrast, for the pseudoscalar and $Z'$ bosons predicted in our model, they remain beyond the reach of current experiments as well as the expected sensitivity at a 14 TeV collider with an integrated luminosity of 300 fb$^{-1}$.