Since the discovery of Higgs particle in 2012, to study the properties of Higgs boson has been the most important goal for the LHC. At the sixth LHC Physics Conference, ATLAS and CMS collaborations simultaneously announced their independent discoveries of “ttH production”, a rare process where a pair of top quarks emits a Higgs boson.
New results from the ATLAS and CMS experiments at the Large Hadron Collider (LHC) revealed how strongly the Higgs boson interacts with the heaviest known elementary particle, the top quark. Researchers from University and Science and Technology of China of Chinese Academy of Sciences contributed an important part to the results.
USTC-ATLAS research group, led by Academician ZHAO Zhengguo, conducted research work including detector operation, data reconstruction, physical research and detector upgrades during the ATLAS experiment.
In studying ZZ* decay channel and Rustem Ospanov, WANG Rongkun from the group used multivariate data analysis to suppress backgrounds from nonprompt and fake leptons, facilitating the discovery of multi-lepton decay channel.
The results demonstrated significance exceeding 5 standard deviations, and provided direct evidence of the Yukama coupling between Higgs boson and top quarks. This will help scientist know more about the properties of the Higgs boson and reveal where to look for new physics.
The studies were published on Physical Review D and Physical Review Letters, respectively.
ATLAS observed direct interaction of Higgs boson with top quarks. (Image by ATLAS Experiment)
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