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649 5924 2047 (Passcode: 612244)
Abstract:
The top quark is the heaviest elementary particle in the Standard Model. The top-Higgs Yukawa coupling is not only the largest and critical for vacuum stability, but also offers a key to the total width and CP properties of the Higgs boson. This coupling is expected to be modified in any physics that goes beyond the Standard Model. In this talk, I will summarize the most accurate measurements on Higgs boson properties derived from studying the top-Higgs Yukawa coupling in proton-proton collisions with the ATLAS detector at LHC.
The production of four top quarks is a rare process, yet it provides a sensitive probe for signs of new physics. Contrasting with measurements derived from on-shell Higgs boson decays, this talk will bring into focus the first observation of four-top-quark production in 2023. Data from this process are used to constrain the top-Higgs Yukawa coupling independently with an off-shell Higgs boson.
Moreover, I will discuss future prospects for Higgs property measurements at upcoming collider experiments.
About the speaker:
Dr. Shuo Han is currently serving as a postdoctoral researcher at the Lawrence Berkeley National Laboratory (LBNL). Over the past 4 years, he has been at the forefront of leading Higgs property measurements in the diphoton final state, as well as directing searches for the Standard Model multi-top productions with the ATLAS experiment. Furthermore, he is accountable for the pre-production procedures of the ATLAS strip detector upgrade at the LBNL. Dr. Han obtained his Ph.D. degree from the Institute of High Energy Physics, Chinese Academy of Science (IHEP), in 2019. His doctoral thesis revolved around the photon identification with the ATLAS detector and the searches for Higgs production in the Z boson plus photon final state. Currently, his interests encompass precise measurements of the Standard Model, the search for new physics at the Large Hadron Collider, the application of novel machine learning techniques in physics analyses, and the study of silicon tracking detectors.