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Colloquia

ics Colloquium
Friday, April 20, 2001
4:00 PM
Physics Building, Room 204
Note special time.
Hank Thacker [Host: Joseph Poon]
University of Virginia
"How QCD Works"
ABSTRACT:
Mathematically, the interaction between quarks and gluons is remarkably similar to the electromagnetic interaction of electrons and photons. But unlike QED, QCD has an essentially nonperturbative structure, as exhibited most strikingly by the absolute confinement of quarks, which represents a fundamental property of the QCD vacuum (complete screening of color charge). Another property of QCD, chiral symmetry breaking, is also a statement about the vacuum, i.e. that it is full of quark-antiquark pairs (analogous to Cooper pairs in BCS theory). Chiral symmetry breaking and quark confinement are probably related phenomena, but the connection is poorly understood. I will discuss recent lattice calculations which have begun to expose the structure of the QCD vacuum.

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