[Jlab-seminars] Physics Seminar Announcement Reminder

[Luci Collins]

*Physics Seminar
Friday, May 28, 2010
11:00AM
CEBAF Center AUD.
Cookies & Coffee at 10:45AM

**"Gauge Invariance, Canonical Quantization in Nucleon Internal Structure"*

*Guorong Wang
Nanjing University, China
  *
 I will discuss the old proton spin crisis caused by the DIS measurement 
of quark spin and the new spin crisis caused by the measurement of quark 
orbital angular momentum. I will show that the misidentification of the 
measured quark spin and orbital angular momentum disturbs the nucleon 
spin structure study. The three different decompositions of nucleon 
total angular momentum and the related gauge invariance and canonical 
quantization principles will also be discussed. I suggest that a Lattice 
QCD calculation of the matrix elements of the proper quark orbital 
angular momentum might lighten the nucleon spin structure study.
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