[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, June 20, 2011
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L104

Asmita Mukherjee
Indian Institute of Technology, Mumbai

*Gluonic Pole Matrix Elements and Universality of Fragmentation Functions*

Gluonic pole matrix elements explain the appearance of single spin 
asymmetries (SSA) in high-energy
scattering processes. They involve a combination of operators which are 
odd under time reversal (T-odd).
Such matrix elements appear in principle both for parton distribution 
functions and parton fragmentation
functions. We show first in a model calculation and then in a model 
independent manner that for parton
fragmentation functions these gluonic pole matrix elements vanish. This 
result is important in the study
of the universality of transverse momentum dependent fragmentation 
functions.
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