Bibliographic Information: A. Arhrib, R. Benbrik, M. Boukidi, S. Moretti. (2024). Anatomy of Vector-Like Bottom-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II. arXiv:2403.13021v3 [hep-ph].
Research Objective: This research paper investigates the phenomenological consequences of incorporating Vector-Like Bottom Quarks (VLBs) into the Two Higgs Doublet Model (2HDM) Type-II. The study focuses on analyzing the decay patterns of VLBs at the Large Hadron Collider (LHC) and exploring their potential to reveal physics beyond the Standard Model (BSM).
Methodology: The authors employ a theoretical framework combining the 2HDM Type-II with various VLB representations, including singlet, doublet, and triplet configurations. They utilize numerical tools like 2HDMC, FeynRules, FeynArts, FormCalc, and MadGraph to simulate particle interactions and decay processes. The study considers relevant theoretical constraints such as unitarity, perturbativity, vacuum stability, and electroweak precision observables (EWPOs). Additionally, it incorporates experimental constraints from Higgs boson measurements, direct searches at colliders, and flavor physics observables like b → sγ decays.
Key Findings: The research reveals that incorporating VLBs into the 2HDM Type-II significantly impacts Higgs boson production and decay, albeit with minor contributions. The study demonstrates that VLBs introduce new decay channels involving additional Higgs bosons (H, A, and H±) predicted by the 2HDM. These exotic decay modes, such as B → H−t, B → Ab, and B → Hb, can compete with standard decay channels like B → W−t, B → Zb, and B → hb. The branching ratios of these decays depend on the VLB masses, mixing angles, and the parameters of the 2HDM. The study highlights the importance of considering both SM and non-SM decay channels when analyzing VLB signatures at the LHC.
Main Conclusions: The authors conclude that VLBs within the 2HDM Type-II offer a rich phenomenology at the LHC, with distinct decay patterns that can differentiate between various VLB representations and potentially uncover BSM physics. The study emphasizes the interplay between theoretical and experimental constraints in shaping the allowed parameter space for VLBs and their impact on decay signatures.
Significance: This research significantly contributes to the field of particle physics by providing a comprehensive analysis of VLB phenomenology within a well-motivated BSM framework. The findings have important implications for experimental searches for VLBs at the LHC and future colliders. The study highlights the potential of VLBs as probes of new physics and motivates further investigations into their properties and interactions.
Limitations and Future Research: The study primarily focuses on on-shell decays of VLBs, assuming their masses exceed those of the additional Higgs bosons. Future research could explore off-shell decays and consider scenarios with heavier Higgs bosons. Additionally, the analysis assumes the alignment limit of the 2HDM, where the lightest CP-even Higgs boson aligns with the observed Higgs boson. Investigating deviations from this limit and their impact on VLB phenomenology would be an interesting avenue for future studies.
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by Abdesslam Ar... at arxiv.org 10-10-2024
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