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"The noblest pleasure is the joy of understanding." — Leonardo da Vinci

"...one of the strongest motives that lead men to art and science is escape from everyday life with its painful crudity and hopeless dreariness, from the fetters of one's own ever-shifting desires. A finely tempered nature longs to escape from the personal life into the world of objective perception and thought." — Albert Eistein

"He who has Art and Science also has religion, But those who do not have them better have religion." — Johann Wolfgang von Goethe

“古之欲明德于天下者，先治其国。欲治其国者，先齐其家，欲齐其家者， 先修其身。欲修其身者，先正其心。欲正其心者，先诚其意。欲诚其意者， 先致其知。致知在格物。” —《大学》

“天地有大美而不言， 四时有明法而不议， 万物有成理而不说。圣人者， 原天地之美而达万物之理。”—《庄子外篇·知北游》

Ph.D. dissertation

I did my Ph.D. study in theoretical physics at the Ohio State University. I did research in the field of phenomenological high-energy physics. My dissertation is Hardronic Molecules and Exotic c-c Mesons (PDF, 790 KB), which is about the two particularly interesting particles X(3872) and Z(4430) in a series of (potentially) exotic c-c mesons discovered since 2003. Effective (field) theories was the main tool.

Effective theories

So, here is my way to describe it in short:

It is possible to understand, at least phenomenologically, a good amount of (19th-centuray) chemistry without much detailed knowledge of quantum mechanics andvirtually nothing of QCD, even the existence of it. By similar philosophy, making useful and nontrivial preditions for many physical systems often do not require a detailed understanding of its "fundamental"/"under-laying" theory, sometimes not even the existence of it. An effective (field) theory is often an implementation of this idea for a specific physical system of interest in order to describe its dynamics in terms of relavent degrees of freedom, and to make phenomenological predictions with relavent accuracy. This is often achieved by leveraging the separation of scales present in the physical system, so the leading order effects can be extracted.

Publications

• Line Shapes of the Z(4430), with Eric Braaten, arXiv:0712.3885v1 [hep-ph]
• The Effects of Charged Charm Mesons on the Line Shapes of the X(3872), with Eric Braaten, arXiv:0710.5482v1 [hep-ph]
• Line Shapes of the X(3872), with Eric Braaten, arXiv:0709.2697v1 [hep-ph]
• Weakly-bound Hadronic Molecule near a 3-body Threshold, with Eric Braaten and Jungil Lee, arXiv:hep-ph/0702128v1
• Operator Product Expansion in the Production and Decay of the X(3872), with Eric Braaten, arXiv:hep-ph/0606115v1
• One-dimensional Dirac equation with double-well potential, with Ying Xu, Ru-Keng Su, arXiv:nucl-th/0306010v1

Quantum Field Theory Problems and Solutions

Solutions to some problems from An Introduction to Quantum Field Theory by Michael E. Peskin and Daniel V. Schroeder. (coming soon ...)

Physics References

Physics Books, a collection of physics books.

My collection research papers, mainly on topics related to my dissertation.

Notes

(coming soon...)