The discovery of a Higgs boson with a mass around 125 GeV has opened a window into the fundamental scalar sector of the Standard Model. Using data collected from the ATLAS detector, various properties of the Higgs boson have been measured, including the differential cross-section of its production via gluon-gluon fusion in the H→WW∗ decay channel. Although we have determined most of the properties with high precision, a significant challenge still remains: the measurement of the Higgs self-coupling, which necessitates the search for Higgs boson pairs. Beyond physics analyses, the detector itself has gone through major upgrades in recent years, particularly in the trigger system, to manage increased event rates at higher energies and instantaneous luminosity during ongoing and future LHC runs. This talk will highlight recent upgrades to the ATLAS trigger system, the differential cross-section measurements in the H→WW∗ channel, and the search for Higgs boson pairs, offering insights into both the detector’s capabilities and key physics challenges.
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