Non-collinearity in high energy processes

Details Non-collinearity in high energy processes Non-collinearity in high energy processes

2008-06-06

arxiv.org/abs/0806.1134v1

Pramana 72:83-95,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages Invited talk at the Xth Workshop on High Energy Physics Phenomenology (WHEPP X), Chennai (India), January 2-13, 2008

Scientific paper

10.1007/s12043-009-0007-x

We discuss the treatment of intrinsic transverse momenta in high energy scattering processes. Within the field theoretical framework of QCD the process is described in terms of correlators containing quark and gluon fields. The correlators, parameterized in terms of distribution and fragmentation functions, contain matrix elements of nonlocal field configurations requiring a careful treatment to assure color gauge invariance. It leads to nontrivial gauge links connecting the parton fields. For the transverse momentum dependent correlators the gauge links give rise to time reversal odd phenomena, showing up as single spin and azimuthal asymmetries. The gauge links, arising from multi-gluon initial and final state interactions, depend on the color flow in the process, challenging universality.

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