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High Energy Physics Seminars
Special Nuclear and High Energy
Wednesday, April 16, 2003
3:00 PM
Physics Building, Room 204
Note special time.

Prof. Xiangdong Ji
[Host: Xiaotong Song]
Univ. of Maryland
"Viewing the nucleon through "color" filters"

ABSTRACT:
While the form factors and parton distributions provide separately
the shape of the proton in coordinate and momentum spaces, a more
powerful imaging of the proton structure can be obtained through
phasespace distributions. In this talk, I introduce the Wignertype
quark and gluon distributions which depict a full3D proton at every
fixed lightcone momentum, like what is seen through momentum
("color")filters. After appropriate phasespace reductions, the
Wigner distributions are related to the generalized parton distributions
(GPD's) and transversemomentum dependent parton distributions, which
are measurable in highenergy experiments. The new interpretation of
GPD's provides a classical way to visualize the orbital motion of the
quarks, which is known to be the key to the spin and magnetic moment
of the proton. 



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