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Exploring the Infinitive Small with Particle Accelerator

Wednesday, 2020, January 8 - 14:00
Zhengguo Zhao

Zhengguo Zhao, academician of the Chinese Academy of Sciences, professor and doctoral supervisor of the Department of Modern Physics, University of Science and Technology of China. He has been engaged in experimental research of particle physics for a long time. He was fully responsible for BES experiment and τ - can physics research. He made important contributions in light hadron spectroscopy, can even element physics and can physics. ψ (2S) and other can even element physics research won the first prize of natural science of Chinese Academy of Sciences in 2000 and the second prize of National Natural Science in 2001. In 1998, he was supported by the National Fund for Distinguished Young Scholars. From 1998 to 2001, he presided over the R-value measurement project in BES, which improved the R-value accuracy of 2-5gev energy region by 2-3 times. The measurement results have been reported at more than 30 important international conferences and have been highly praised. Two papers related to R-value measurement published on PRL, whose citation rate is marked as "top citation" in SLAC database. From 1999 to 2001, as the spokesperson of BES international cooperation group, he completed the acquisition of 58 million J / psi cases, which is the largest sample in the world. The first version of "BESIII and its physics goal" design report was organized and completed. As the first winner, he won the first prize of Beijing Science and Technology in 2002, the Outstanding Scientific Achievement Award of Chinese Academy of Sciences in 2003 and the second prize of National Natural Science in 2005. In 2001, he awarded the Outstanding Young Scientist of Chinese Academy of Sciences. In 2013, he was elected academician of the Chinese Academy of Sciences.

Particle physics is to find out answers to the questions: what are the fundamental building blocks of our universe, and how do they interact with each other? For the most basic inquiries into the dynamics and structure of matter, space, and time, we seek the simplest kinds of interactions at the highest possible energies. These typically entail particles having high energy and the interactions of the simplest kinds of particles: leptons, quarks and field quanta with size down to 10^{-17} m.

This presentation is to briefly introduce the Standard Model picture of the elementary particle physics, and how we use cutting edge technology to build big facilities like particle accelerator and particle detector to discover any as yet unobserved constituents that carry information of the early history, the rules governing the interaction among them, and the nature of the space and time in which they reside. Large Hadron Collider (LHC) and Beijing Electron Positron Collider will be used as examples to review their highlighted results that related to the key science questions. Prospect on the future program of particle physics with accelerators will be discussed.