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<div><font color="#000080"><b>Old Dominion University</b></font></div>
<div><font color="#000080"><b>Department of Physics</b></font></div>
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<div><font color="#31849B"><b>Spring Colloquium Series</b></font></div>
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<div><font color="#17365D" size="5"><b>Tuesday January 17, 2012</b></font></div>
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<div><font color="#31849B" size="5"><b>"Deconstructing the Partonic Origins of the Proton Spin"</b></font></div>
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<font color="#1F497D" size="5" face="Times New Roman, serif"><b>Dr. Renee Fatemi</b></font></font></div>
<div><font color="#1F497D" size="5"><b>University of Kentucky</b></font></div>
<div><font size="3" face="Calibri, sans-serif">The discovery of quarks in the 1960's launched a now classic question in nuclear physics: How do the interactions between quarks and gluons produce the fundamental
properties of the proton and neutron? The nucleon electric charge is simply the sum of the valence quark charges, while the mass is largely due to the energy stored in the color fields or gluons. In contrast, it is not yet understood how the spin and orbital
angular momentum of three valence quarks and a nearly infinite number of gluons and sea quarks combine to produce a spin 1/2 nucleon. Inclusive deep inelastic scattering experiments have limited the valence + sea quark contribution to less than a third of
the total nucleon helicity distribution. Alternative measurements and techniques, currently being pursued in experiments worldwide, are needed to provide precision insights into the gluon spin, the flavor separated quark spin and the partonic orbital momenta
contributions. This talk will present the most recent experimental contributions to these goals from the STAR spin program at the Relativistic Heavy Ion Collider.</font></div>
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<div><font size="4">Presentation: Physical Sciences Building II 1100 @ 3:00 pm</font></div>
<div><font size="4">Refreshments: 1st Floor Atrium @ 2:30 pm</font></div>
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<div><font size="4">More details at <a href="http://www.physics.odu.edu">
http://www.physics.odu.edu</a></font></div>
<div><font size="4">All are Welcome<font size="3">!</font></font></div>
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