Nuclear Seminar

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Date/Time:Thursday, 19 May 2011 from 4:10 pm to 5:10 pm
Location:A401 Zaffarano Hall
Contact:Prof. James Vary
Phone:515-294-8894
Channel:Nuclear Physics
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"Universality of T-odd Fragmentation Functions and Gluonic Pole Matrix Elements"
Prof. Asmita Mukherjee, Indian Institute of Technology, Bombay

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 that for parton fragmentation functions these gluonic pole matrix elements vanish as a consequence of the analytic structure of scattering amplitudes in Quantum Chromodynamics. This result is important in the study of the universality of transverse momentum dependent fragmentation functions.