Speaker
Description
A comprehensive study of triple Higgs boson production in the 4𝜏2𝑏 decay final state is performed for the first time at a future 100 TeV hadron collider. The analysis incorporates modified Higgs self-couplings via trilinear Higgs self-coupling 𝑐3 and quartic Higgs self-coupling 𝑑4, enabling for a model-independent investigation of potential new physics effects. Higgs bosons are reconstructed using both resolved and boosted techniques. To optimize sensitivity across different kinematic regions, we introduce a novel event categorization strategy based on the triple Higgs invariant mass spectrum and the multiplicity of boosted Higgs bosons. In addition to a traditional cut-based analysis, a Boosted Decision Tree (BDT) approach is employed to exploit multivariate correlations among kinematic observables, leading to a significant improvement in sensitivity. Our result demonstrates that the 4𝜏2𝑏 channel provides a viable pathway for probing the Higgs quartic coupling, complementing the existing multi-Higgs production studies, and could reach 5 𝜎 in significance for 𝑐3≤−1 and 𝑑4≥10 in the scanned range.
This work has been published on JHEP: https://doi.org/10.1007/JHEP08(2025)040
