Special Colloquium
Tuesday, April 25, 2006
3:30 PM
Physics Building, Room 204
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"Can Quarks in a Polarized Nucleon Tell Left from Right ?"

Xiaodong Jiang , Rutgers University
[Host: Nilanga Liyanage]
In the strong interaction, which follows the parity-conserving theory of Quantum Chromodynamics (QCD), can quarks in a polarized nucleon manage to tell left from right ? For "collinear quarks" in a longitudinally polarized nucleon, the answer is simply NO. However, when a nucleon's spin is oriented transverse to it's momentum, quarks inside can figure out left from right through their transverse spin distributions (transversity) and through their angular motions. Recent spin physics experiments from HERMES at DESY and COMPASS at CERN have revealed such an amazing behavior of quarks for the first time, left us with even more questions. Two upcoming Jefferson Lab experiments are designed to provide more answers as to how exactly u- and d-quarks tell left from right in a transversely polarized nucleon.

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