[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Friday, Jan. 29, 2010
10:00 a.m.
CEBAF Center, Room F113
  

*Transverse-Momentum Dependent Parton Densities: Definition,
Renormalization, Evolution and All That
*

Igor O. Cherednikov
Bogoliubov Laboratory of Theoretical Physics  
Joint Institute for Nuclear Research Dubna, Russia   
   

Recent results of our study of the transverse-momentum dependent parton 
densities ("TMDs"), which are important ingredients of the description of 
semi-inclusive hadronic processes, are presented. Special attention is 
payed to renormalization and gauge invariance properties of TMDs. As an 
illustration, their leading-order anomalous dimensions are calculated in 
the light-cone gauge with different additional gauge-fixing conditions. 
It is shown that the RG properties are helpful to reveal, in an economic 
way, the general structure of the gauge links entering the operator 
definition of TMDs. The evolution equations for TMDs, as well as the 
status of factorization in semi-inclusive hadronic processes, are 
considered. The current open problems of the TMD-approach are discussed.
  

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