Exploring Charged Higgs at the Future Circular Collider (FCC): A Review of Two-Higgs-Doublet Models

TL;DR

This work analyzes the discovery prospects of charged Higgs bosons predicted by Two-Higgs-Doublet Models (THDMs), focusing on Type III (Lepton-specific) and Type IV scenarios at a future FCC-hh collider with √s = 100 TeV. It systematically studies the production channel pp → tH^−, the decays and couplings of H^±, and the resulting kinematic distributions against b-b̄ backgrounds, using benchmark points BP-I and BP-II and aligning to sin(β−α) ≈ 1. The study computes total decay widths and branching ratios with CalcHEP, explores invariant-mass and p_T distributions, and applies multivariate analyses (TMVA with MLP, BDT, and Likelihood) to estimate observability, finding MLP and BDT provide higher significance than Likelihood. The FCC-hh environment yields large production cross sections and clear discriminator power for H^±, highlighting a viable path for probing extended Higgs sectors and guiding future experimental searches in THDM-III and THDM-IV.

Abstract

This paper reports on the theoretical investigation of charged Higgs bosons and their coupling to fermions within the Two Higgs Doublet Model (THDM). The study focuses on the discovery potential of charged Higgs bosons predicted in Types III and IV at the future Circular Hadron-Hadron Collider (FCC-hh) with a center-of-mass energy of (\sqrt{s} = 100) TeV. By analyzing their decays, couplings to fermions, branching ratios, and production cross-section via (pp \rightarrow tH^-), we investigate the signatures of charged Higgs bosons, including kinematical distributions based on the background processes of (b\bar{b}) quarks.

Figures (16)

• Figure 1: Plot is shown between $M_{H^\pm}$ and $\Gamma$ for $\tan\beta=1$. Here, the Plot (a) shows the decay width of charged Higgs to all possible decay modes for BP-I. While Plot (b) shows BR of charged Higgs to all possible decay modes for BP-II
• Figure 2: Plot between $M_{H^\pm}$ and BR in % for $\tan\beta=1$. Plot (a) shows the BR of charged Higgs to all possible decay modes for BP-I. Plot (b) shows BR of charged Higgs to all possible decay modes for BP-II
• Figure 3: Plot between $M_{H^\pm}$ and $\%BR$ for $\tan\beta$=1. Fig. (a) shows BR of charged Higgs for all possible decay modes for BP-II. Fig. (b) shows BR of charged Higgs to all possible decay modes for BP-I
• Figure 4: Total Decay width of charged Higgs as a function of $\tan\beta$ for $m_H^{\pm}$ = 500 GeV of all THDMs
• Figure 5: (a) The total Decay width of charged Higgs as a function of $m_H^{\pm}$ for $\tan\beta$ = 7 of all THDMs. (b) Plot between %BR and $m_H^{\pm}$ for the decay $H^- \rightarrow b\bar{t}$ of all THDMs