Single spin asymmetries and gluonic pole matrix elements

Abstract

We investigate the emergence of single spin asymmetries (SSA) in hard processes using transverse momentum dependent (TMD) distribution and fragmentation functions. Specifically, the description of SSA involves time reversal-odd functions. Process-dependence (non-universality) in measurements of SSA can be attributed to the non-trivial gauge link structure in the TMD correlator. Finding the appropriate gauge links, however, also enables us to characterize the non-universality

4 pages, 1 figure, contribution to DIS2008 (April 2008), London (UK)

References in corpus (2)

• Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum
• Spectral analysis of gluonic pole matrix elements for fragmentation