High Energy Physics Seminars

The discovery of the Higgs boson in 2012 completed the Standard Model of particle physics, yet key questions such as the nature of dark matter and the origin of the matter–antimatter asymmetry remain unresolved. A central goal of the LHC physics program is to probe the Higgs potential, as any deviation from the Standard Model expectation could alter the dynamics of the electroweak phase transition in the early universe, potentially offering insight into the origin of the matter–antimatter asymmetry and the mechanism of baryogenesis. This potential can be experimentally accessed through measurements of Higgs boson self-interactions in Higgs boson pair (HH) production. This seminar presents the results of the ATLAS Run-2 search for non resonant di-Higgs production in the bbˉτ+τ− final state using 140 fb−1 of proton–proton collision data collected between 2015 and 2018. The talk will discuss key analysis techniques, highlight improvements introduced for Run-3, and provide an outlook for future analysis at the High-Luminosity LHC.