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"Viewing the nucleon through "color" filters"


Prof. Xiangdong Ji , Univ. of Maryland
[Host: Xiaotong Song]
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 phase-space distributions. In this talk, I introduce the Wigner-type quark and gluon distributions which depict a full-3D proton at every fixed light-cone momentum, like what is seen through momentum ("color")-filters. After appropriate phase-space reductions, the Wigner distributions are related to the generalized parton distributions (GPD's) and transverse-momentum dependent parton distributions, which are measurable in high-energy 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.
High Energy Physics Seminar
Wednesday, April 16, 2003
3:00 PM
Physics Building, Room 204
Note special time.
Note special room.

Special Nuclear and High Energy


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