Determining the structure of the Higgs sector by precisely evaluating constraints of perturbative unitarity

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14474
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Nihon University (2021-2023); Kitakyushu National College of Technology (2020)
• Principal Investigator: KIKUCHI Mariko 日本大学, 工学部, 助教 (20824642)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 量子補正 / 拡張ヒッグス模型 / 崩壊分岐比

Outline of Final Research Achievements

The Higgs boson (h) measurements at the LHC are consistent with the predictions of the Standard Model. It indicates the near-alignment in extended Higgs models. We have systematically studied radiative corrections quantum on decay branching ratios of additional Higgs bosons in extended Higgs models. We have published numerical program code for the decay branching ratios of all two-body decay processes of all additional Higgs bosons in several extended Higgs models (THDM, HSM and IDM). We also have shown the importance of model verification from three directions: precise measurement of h, direct search for additional Higgs bosons and theoretical restrictions such as perturbative unitarity.

Free Research Field

素粒子論

Academic Significance and Societal Importance of the Research Achievements

本研究で作成・ヴァージョンアップさせたH-COUPを使えば誰しもがh及び付加的ヒッグスボソンのすべての2体崩壊の分岐比を高次補正を含めて高精度で理論計算でき、また理論的制限も評価できる。H-COUPを用いることで、今後の直接探索、間接探索、理論的制限を用いた複数の拡張ヒッグス模型におけるシナジー的検証方法によりヒッグスセクターの構造決定の研究が促進される。