New physics implication of Higgs precision measurements

TL;DR

This paper explores how future Higgs factories can provide precise measurements that constrain new physics models like 2HDM and MSSM, offering complementary insights to collider searches.

Contribution

It performs a comprehensive global fit to Higgs data to derive constraints on 2HDM and MSSM parameters, including one-loop effects and mass sensitivities.

Findings

Strong constraints on $ ext{cos}(eta- ext{alpha})$ and heavy Higgs masses.

Complementary limits on $m_A$ and $m_{SUSY}$ to LHC searches.

Sensitivity comparisons among CEPC, FCC-ee, and ILC.

Abstract

Studying the properties of the Higgs boson can be an important window to explore the physics beyond the Standard Model (SM). In this work, we present studies on the implications of the Higgs precision measurements at future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95 % C.L. constraints on the model parameter spaces of Two Higgs Double Model (2HDM) and Minimal Supersymmetric Standard Model (MSSM). In the 2HDM, we analyze tree level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on $\cos(\beta-\alpha)$, heavy Higgs masses and their mass splitting are complementary to direct search of the LHC as well as possible future Z pole precision measurements. For the MSSM, we study both the Higgs couplings and mass precisions. The constraints on the CP-odd Higgs mass $m_A$ and stop mass scale $m_{SUSY}$ can be complementary to the direct search of HL-LHC. We also compare the sensitivity of various future Higgs factories, namely Circular Electron Positron Collider (CEPC), Future Circular Collider (FCC)-ee and International Linear Collider (ILC).