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Friday, April 7, 2006
Physics Building, Room 204
Note special time.
[Host: Genya Kolomeisky]
"Nucleon Structure Studies with Polarized Photons and Polarized Nucleons"
The quark and gluon structure of the nucleons (protons and neutrons) was
established by illuminating atomic nuclei with high energy unpolarized real and
virtual photons. The interactions between quarks follow "scaling" rules that
were also established with unpolarized photons. With polarized photons it is
possible to explore the nucleon structure even further. Polarized photons have
been used to determine that quarks carry only 1/3 of the spin, but the
distribution of spin among types ("flavors") of quarks is still under study. And
the "missing" spin carriers are still being investigated. The interactions
between quarks and gluons have barely been explored experimentally. Polarized
photons can also uncover the details of those interactions and relate them to
calculations based on Quantum Chromodynamics - QCD, the fundamental theory of
strong interactions. There is an extensive program of nucleon structure studies
with polarized photons and polarized nuclear targets at Jefferson Lab with the
goal of answering some of these and other related questions. Highlights of the Hall C component of this program will be presented.
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