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Zoom: 682 6157 0557 (Passcode: 219130)
Abstract: The Higgs field permeates all of space and interacts with fundamental particles in the Standard Model. In 2012, a particle with properties consistent with the Higgs boson was observed by the ATLAS and CMS experiments at the LHC at CERN. Since then, more than 30 times as many Higgs bosons have been recorded by the ATLAS experiment, allowing much more precise measurements. In the talk I’ll go through the combination of an unprecedented number of production and decay processes of the Higgs boson on the basis of this larger dataset to scrutinize its interactions with elementary particles. One of the intriguing while not precisely constrained characteristics of the Higgs boson is its self-interaction. The electroweak symmetry is broken spontaneously by the non-trivial structure of the Higgs boson potential. This mechanism allows fundamental particles to acquire their mass. Constraints on the Higgs boson self-coupling are set as well at ATLAS. In the end of my talk, I’ll present the projections of the Higgs coupling property measurements at High-Luminosity LHC.
Biography: Dr. Kunlin Ran is currently a postdoctoral fellow at Deutsches Elektronen-Synchrotron (DESY). He obtained bachelor degree in 2016 at Wuhan University and his PhD degree in 2021 at Institute of High Energy Physics, CAS. He used to do researches at DESY as a joint PhD student as well. His thesis topic was photon performance measurement and the Higgs boson property measurements in the ATLAS experiment. He made dominant contributions in the search of the Higgs decay to Z boson and a photon, Higgs coupling combination measurements and constraints of Higgs trilinear self-interaction in the ATLAS experiment. Besides, he took the leading role in the expected research of the Higgs to dimuon process in the Circular Electron Positron Collider (CEPC) experiment. His research interests are Higgs coupling property measurements including the self-coupling constraints from the combination and search for di-Higgs productions with four b final states. Beyond that, He is making contributions in the ATLAS upgrade ITK module studies.