Boosting the Higgs boson into unexplored territory with ATLAS

The discovery of the Higgs boson and the combination of measurements across its various production and decay modes have enabled an increasingly precise characterization of its properties. Yet, important opportunities remain to probe physics beyond the Standard Model through deviations in Higgs boson production rates and kinematic distributions, particularly in the high-transverse-momentum (boosted) regime. Especially sensitive to potential new interactions, this region remains largely unexplored due to the rapidly falling Higgs boson production cross-section and the resulting need for large integrated luminosities. It also poses significant experimental challenges, as the Higgs boson decay products become highly collimated, requiring dedicated reconstruction techniques.

This seminar will present two new ATLAS measurements of Higgs boson production with transverse momentum above 300 GeV in the H→bb and H→ττ decay channels. The analyses exploit the full Run 2 dataset together with a partial Run 3 dataset, corresponding to an integrated luminosity of approximately 300 fb⁻¹. They also exploit advanced machine-learning techniques that are essential for the reconstruction and identification of Higgs bosons in this challenging kinematic regime. These results provide some of the most sensitive probes to date of Higgs boson production in the boosted regime and the search for physics beyond the Standard Model.