CEPC Research Report: Higgs Physics Analysis

TL;DR

This report summarizes recent advancements in Higgs physics analysis at the CEPC, including detector concepts, physics potential, and improved measurement techniques at different energies, notably around 240GeV and 360GeV.

Contribution

It introduces new analysis methods and interpretations that enhance Higgs measurement precision and explores physics potential at multiple center-of-mass energies.

Findings

Enhanced Higgs width measurement precision by a factor of 2 at 360GeV.

Improved Higgs decay mode analysis including b/c/g and tau tau channels.

Development of advanced jet reconstruction and lepton identification techniques.

Abstract

In November 2018, the CEPC released the Conceptual Design Report (CDR) with the physics potential investigation and the analysis about different detector concepts. Since then, intensive researches on the Higgs Physics at the CEPC have been progressed. The run at top thresholds are also taken into consideration and the physics potential around the center-of-mass energy of 360GeV is studied. The $ttH$ channel information boost the precision of Higgs width measurement by a factor of 2 with respect to 240 GeV Higgs Runs. Different Higgs decay modes are analyzed in the CEPC Higgs factory at the center-of-mass energy of 240GeV, including Higgs to b/c/g and Higgs to $\tau\tau$, which improves the Higgs measurement. Advanced analysis technologies are developed and applied in the analysis, such as jet reconstruction and lepton identification in jets. New interpretations are under developing to improve the performance.