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Physics Colloquium - January 24, 2013

The Puzzle of Nucleon Spin

Many properties of nucleons have been measured and well-known for a long time. One of these properties, the spin of the proton, has been known for about 80 years, but the origin of its spin still remains a puzzle. About 30 years ago, it was shown that quarks, which are constituents of the proton, surprisingly, contribute only a fraction of the proton’s spin. This interesting result led to the “spin crisis” and to further investigations of the origin of spin of the proton. This talk will present some recent results of these investigations, including those from the STAR experiment at Brookhaven National Laboratory, that will help connect some of the pieces to the puzzle of the nucleon spin.

by
Professor David Grosnick
Department of Physics and Astronomy
Ball State University
David Grosnick