Study of CP properties of top Yukawa coupling with ATLAS experiment and testing of ATLAS HL-LHC Pixel detector readout chip

by Dr Hongtao Yang (CERN)

Wednesday 7 Jul 2021, 10:00 → 12:00 Asia/Shanghai

IHEP main building

ABSTRACT: Search for CP mixing in the Higgs sector is well-motivated given the large matter-antimatter asymmetry in Universe that cannot be explained by the Standard Model. While the CP properties of Higgs boson interaction with gauge bosons have been explored since Higgs boson discovery, direct constraints on CP mixing in fermion Yukawa couplings were not available until last year. In the first half of this talk, I will discuss the first ATLAS direct constraint on CP mixing in top Yukawa coupling using Higgs to diphoton decay channel. Besides finishing the Run 2 analyses, the ATLAS experiment is also making good progress in the Phase 2 detector upgrade. Among all the projects, the upgrade of the Inner Tracker (ITk) Pixel detector is particularly important due to the extreme irradiation and data rate at High-Luminosity LHC. In the second half of this talk, I will introduce the latest progress on the testing of Pixel detector readout chip ITkPix-V1. About the speaker: Dr. Hongtao Yang is a Chamberlain Fellow at Lawrence Berkeley National Laboratory. He received his B.S. degree from Peking University in 2010, and Ph.D. from the University of Wisconsin-Madison in 2016. As a member of the ATLAS experiment since 2010, Dr. Yang made important contributions to the Higgs boson discovery, and played key roles in the measurements of Higgs boson mass, spin, CP, and couplings. He was the co-convener of the ATLAS Higgs properties and combinations working group between 2017 and 2019. He now serves as the ATLAS convener of the LHC Higgs fiducial/differential/template cross-section working group. Besides Higgs physics, Dr. Yang also made significant contributions to the Phase 2 Upgrade of the ATLAS Pixel detector. He is currently committed to the testing of radiation-hard Pixel detector front-end readout chips at Lawrence Berkeley National Laboratory. Meeting Room: Zoom-only Zoom Link: https://ihep-ac-cn.zoom.com.cn/j/84667901218?pwd=SFUvU1I3TllrYlExeC9yN3cwMTFYdz09 Zoon ID: 84667901218 Passed: 978447

Slides ttH_CP_ITkPix_V1_testing_hongtao_yang.pdf