Search for Higgs boson pair production in the HH->bbγγ final state with the full Run 2 + partial Run 3 pp collision data collected by the ATLAS Experiment

by Punit Sharma (Brookhaven National Lab)

Wednesday Jun 4, 2025, 3:00 PM → 5:00 PM US/Eastern

Small Seminar Room (510)

The ATLAS experiment is a general-purpose detector at the Large Hadron Collider (LHC) at CERN. Since the discovery of the Higgs boson in 2012, one of the key objectives of the ATLAS physics program has been to study the properties of the Higgs boson, including its self-interactions. In this talk, we present a study of di-Higgs production in the HH→bbγγ decay channel using the full Run 2 dataset (2015–2018) and a partial Run 3 dataset (2022–2024) collected by ATLAS. This channel is considered one of the “golden channels” for probing the Higgs self-coupling, due to the large branching ratio of the Higgs boson decaying to bb, combined with the excellent photon reconstruction and triggering performance of the ATLAS detector. Given the statistical limitations of this analysis, the addition of Run 3 data leads to a significant improvement in sensitivity. We explore the impact of incorporating reprocessed Run 2 data alongside Run 3, evaluating the resulting effects on exclusion limits, expected significances, and constraints on the trilinear Higgs boson self-coupling modifier.

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Hosted by: Gabriele D'Amen (BNL) - gdamen@bnl.gov