Laser-assisted production of the light charged Higgs boson from top quark decay in the type-I two Higgs doublet model

TL;DR

This study explores how intense circularly polarized laser fields can significantly enhance the decay rate of top quarks into charged Higgs bosons in the type-I two Higgs doublet model, aiding experimental detection.

Contribution

It demonstrates that external laser fields can modify decay branching ratios, providing a novel method to improve detection prospects of charged Higgs bosons at colliders.

Findings

Laser fields can increase the top decay into charged Higgs bosons to a branching ratio of 0.97.

The decay width is highly sensitive to laser intensity and frequency.

Strong electromagnetic fields could serve as a new tool in particle searches beyond the Standard Model.

Abstract

We investigate the impact of a circularly polarized laser field on the top quark decay process into a charged Higgs boson ($t\rightarrow bH^+$) within the type-I two Higgs doublet model. Our study aims to explore how an external electromagnetic field can modify key observables and potentially facilitate the experimental detection of the charged Higgs boson, addressing challenges related to missing energy in collider experiments such as the LHC. Employing the Dirac-Volkov formalism, we model the interaction between charged particles and the laser field and demonstrate that the presence of the laser can notably influence the decay branching ratios under suitable conditions. The analysis reveals that both the intensity and frequency of the laser field play a crucial role in determining the decay width. In particular, for a laser field strength of $3.8\times 10^{14}$ V/cm and a photon energy of $0.117$ eV, the branching ratio of the top quark decaying into a charged Higgs boson with mass in the range $80$-$150$ GeV and a bottom quark reaches $0.97$, surpassing the standard $t\rightarrow bW^+$ channel. These results suggest that strong electromagnetic fields can serve as an effective mechanism to enhance signals of new particles, offering promising avenues for experimental searches beyond the Standard Model.