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Abstract:
One of classic ways of studying QCD events in high-energy collisions is to measure event shape variables that are observables designed to characterize geometric feature of the event. By using effective field theory, some of event shapes was predicted to very high accuracy and the strong coupling constant was determined at 1% accuracy. However, the value of coupling constant tends to be lower than other results. The discrepancy has not been resolved for a decay and this challenges our understanding of QCD using effective field theory. I will discuss current status of the discrepancy, review the effective field theory method, and report our progress on event shapes for future electron-ion collider which offers new opportunity to make an independent test and may shed lights on the discrepancy.
Biography:
Prof. Kang joined Institute of Modern Physics, Fudan University in September 2017. He was a Director's postdoctoral fellow in Los Alamos National Lab and a postdoctoral research associate at Center for Theoretical Physics, MIT. He received Ph. D. in theoretical physics from the Ohio State University in 2011, and his B. S. from Korea University in 2005. His research interests involve theoretical nuclear and particle physics. In particular, he focuses on the development and application of effective field theories to answer fundamental questions about interactions between elementary particles specifically focusing on the strong interaction described by Quantum Chromodynamics (QCD). He developed a velocity resummation in quarkonium production by using Non-relativistic QCD and explained a scaling behavior and its violation in ultracold atom system by applying low-energy Nucleon effective theory. His current researches focuses on prediction for jet productions at high-energy colliders by using Soft-Collinear Effective Theory.
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