Abstract: 

The Higgs mechanism is responsible for elementary particle mass generation in the Standard Model of particle physics. While ATLAS and CMS experiments have confirmed its role in giving mass to the weak bosons and 3rd generation charged fermions, whether Higgs mechanism also provides mass for the 2nd generation fermions remains an open question. The decay of the Higgs boson into a muon pair (H→μμ) provides a unique opportunity to directly answer this question at LHC. In this talk, I will present the latest ATLAS search for H→μμ based on proton-proton collision data collected at √s = 13.6 TeV during ongoing Run 3 up to 2024, combined with Run 2 data collected at 13 TeV. The search establishes the first evidence of H→μμ decay from ATLAS experiment, marking a milestone in understanding the origin of mass for the 2nd generation fermions.

Biography: 

Hongtao Yang received his B.Sc. from Peking University in 2010, and his PhD from University of Wisconsin-Madison in 2016. He worked as Chamberlain Fellow at Lawrence Berkeley National Lab until 2022 before joining University of Science and Technology of China as faculty. Hongtao has been a member of ATLAS Collaboration since 2010. He made direct contributions to the discovery of the Higgs boson in the H→γγ channel. Since then, he has played important roles in key Higgs boson property measurements, including serving as analysis contact of the latest ATLAS H→μμ evidence results. Hongtao is currently co-convener of the ATLAS Higgs and Di-Higgs Physics Working Group.

Alternative online link： https://meeting.tencent.com/dm/Ne3J1NIQo456

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