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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
Friday, May 18, 2011<br>
11:00AM<br>
CEBAF Center AUD.<br>
<font color="#3333ff">Cookies & Coffee at 10:45AM<br>
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<br>
<b><font color="#ff0000"><big>Franco Bradamante <br>
Trieste University and INFN, Trieste Italy <br>
<br>
"The Spin Structure of the Nucleon: </big> <big><br>
a Phenomenological Introduction and the Most Recent Results"</big></font></b>
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After a short historical introduction on the understanding of the <br>
structure of the proton and of the neutron, the investigation of the
<br>
spin structure of the nucleon via semi- inclusive deep inelastic <br>
scattering on polarized nucleons is updated with the most recent <br>
results of the Jefferson LAB, HERMES, and COMPASS experiments. A <br>
short description is given of these experiments, which are <br>
complementary in phase space and use sophisticated and different <br>
techniques to polarize the nucleon targets. The cases of target
spin <br>
parallel or orthogonal to the direction of the incoming lepton
require <br>
different experimental techniques, have a different phenomenology
and <br>
need a different theoretical treatment. After reviewing these <br>
differences, the most recent transverse spin advances are presented,
<br>
and evidence is given that new properties of matter at the partonic
<br>
level have been discovered. <br>
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