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

M. Jakha, S. Mouslih, M. Ouhammou, R. Chahri, S. El Asri, S. Taj, B. Manaut

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.

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

Abstract

We investigate the impact of a circularly polarized laser field on the top quark decay process into a charged Higgs boson () 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 V/cm and a photon energy of eV, the branching ratio of the top quark decaying into a charged Higgs boson with mass in the range - GeV and a bottom quark reaches , surpassing the standard 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.

Paper Structure

This paper contains 6 sections, 39 equations, 4 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Analytical framework for top quark decay
  3. Standard decay $t\rightarrow bH^+$ without laser interaction
  4. Decay $t\rightarrow bH^+$ under a circularly polarized laser field
  5. Results and discussion
  6. Conclusion

Figures (4)

  • Figure 1: Tree-level Feynman diagram for the decay of the top quark into a charged Higgs boson and a bottom quark ($t \rightarrow b H^+$).
  • Figure 2: Dependence of the total decay width of the top quark on the number of absorbed photons $s$ in the presence of the laser field. Unless stated otherwise, the parameters are: $M_{H^+} = 150$ GeV, $\tan \beta = 3$, $\xi_0 = 10^6$ V/cm, and $\hbar \omega = 2$ eV.
  • Figure 3: Behavior of branching ratios for top decay as a function of $\tan \beta$, with $\xi_0=3.8\times10^{14}$ V/cm, $\hbar\omega=0.117$ eV and $M_{H^+}=150$ GeV.
  • Figure 4: Contour plot illustrating the total decay width of the top quark in the presence of a laser field, as a function of the field strength and frequency. The parameters are $M_{H^+} = 150$ GeV and $\tan \beta = 3$.