Single spin asymmetries and gluonic pole matrix elements
P.J. Mulders
TL;DR
This paper explores the origin of single spin asymmetries in high-energy processes through the lens of transverse momentum dependent functions, emphasizing the role of gauge link structures in understanding their process dependence.
Contribution
It clarifies how gauge link structures influence the process dependence of SSA and connects this to gluonic pole matrix elements, advancing the theoretical understanding of spin asymmetries.
Findings
Process dependence of SSA is linked to gauge link structures.
Gluonic pole matrix elements characterize non-universality.
Gauge links help identify the origin of time reversal-odd functions.
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
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Taxonomy
TopicsMagnetic Properties of Alloys · Superconducting Materials and Applications · Physics of Superconductivity and Magnetism