Seminarium Teorii Oddziaływań Elementarnych
Sala Duża Teoretyczna (229), ul. Hoża 69
2010-12-06 (13:15) 
Krzysztof Kurek (IPJ)
Understanding the proton's spin structure
After more than 20 years of measurements of the spin-dependent structure functions of the nucleon the third generation of precise polarized experiments is now running and new data are analyzed. Although our knowledge about the spin decomposition in the frame of quark parton model and QCD is now more complete and the polarized parton distribution functions are better constrained by data, the driving question for QCD spin physics still has no answer: where does the nucleon spin come from? I will try to present a modern understanding of the problem and a possible explanation in the light of new experimental data and new results obtained in lattice QCD.