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USTC Promotes Searching for Dimuon Decay of Higgs Boson
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The European Nuclear Center (CERN) reported a significant evidence proving the Higgs particle decays to the final state of the dimuon on the Large Hadron Collider (LHC).
The detection significance of the signal obtained by the CMS and ATLAS experiments was 3σ and 2σ, respectively; when combined, the evidences for the detected signal is unequivocal (>3σ). It is the first time to directly detect the coupling of Higgs boson and the second-generation fermion.
The ATLAS results in this report were jointly completed by several organizations, including University of Science and Technology of China (USTC), Shandong University (SDU), and Tsinghua University (THU). The analysis methods used in the latest results mostly relied on a preliminary analysis work done by USTC and SDU jointly.
Researchers from USTC did the multiple analysis containing software framework, reconstruction optimization of the muon, signal system error, and research on the new VH analysis channel.
The Higgs boson plays a pivotal role in the "Standard Model" theory of particle physics that describes the microscopic world. Elementary particles interact with the Higgs field to gain mass. The Higgs boson is closely bound up with the origin of the material world and the early evolution of the universe, so it has been one of the cores of theoretical and experimental research in particle physics.
The discovery of the Higgs particle marks the success and completeness of the "Standard Model". However, there are also major issues unexplained by the "Standard Model" in nature, such as the existence of dark matter, the mass of neutrino, and the asymmetry of the universe's positive and negative matter. Therefore, one of the important projects in particle physics is to unfold around the Higgs particle, aiming to gradually reveal its property and connection with the unknown world.
The current research focuses on using the unique data recorded by the ATLAS and CMS experiments to study the coupling of the Higgs boson and the other basic particles.
The coupling between the Higgs particle and the vector boson, as well as the third-generation Fermion's Lepton, top and bottom quarks, has been discovered gradually, whose measured coupling strength is consistent with the predictions of the "Standard Model".
It is very difficult to measure the coupling between the Higgs particle and the first- and second-generation fermions due to the weak intensity and large background noise. Under current technical conditions, measuring the coupling of the Higgs particle and the muons is the most promising.
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