Abstract
After the discovery of Higgs boson, the Electro-Weak symmetry breaking mechanism (EWSB) has been established. However, the dynamics source and the nature of the EWSB is still unknown. For example, whether it is the second or the first order phase transition, which is determined by the potential of the Higgs field and played an important role in the early universe. The tri-linear Higgs self-coupling is sensitive to explore the Higgs potential and also sensitive to the new physics Beyond the Standard Model (BSM). At LHC, Higgs self-coupling could be explored via the di-Higgs production.
The seminar will present the latest study on the Higgs self-coupling and the several related BSM physics searches at LHC.
Biography
Lei Zhang, professor at School of Physics in Nanjing University. Prof. Zhang got PhD degree at BEPCII-BESIII experiment from Nanjing University in 2011. After that, he worked on ATLAS experiment as a postdoc researcher based at CERN in Switzerland and Freiburg in Germany, respectively. From 2018, he joined in the school of physics in Nanjing University as a full professor.
Prof. Zhang’s group has involved in several HEP experiments, i.e. ATLAS, BESIII, JUNO, as well as CEPC project. Prof. Zhang have made a significant contribution to establishing Higgs to bottom quark and to tau lepton Yukawa couplings. He has extensively studied the Higgs self-coupling via Di-Higgs production and the physics beyond standard model. To guarantee a successful operation at LH-LHC, Prof. Zhang participated the High Granularity Timing Detector (HGTD) of ATLAS phase-II upgrade and is in charge of the Peripheral Electronics Board (PEB) R&D and production, in collaboration with IHEP (Beijing) group. Prof. Zhang also leads the R&D effort to develop the forward calorimeter (LumiCal) for the precise luminosity measurement at the CEPC project. The proto-type of LumiCal will be deployed at the BEPCII collider by the end of 2026 for both fast luminosity monitoring and Initial State Radiation photon tagging for BESIII experiment.
Anyone interested is welcome to attend.