Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-21
PoS LC2008:034,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in the proceedings of Light Cone 2008: Relativistic Nuclear and Particle Physics (LC2008), Mulhouse, France, 7-11 Ju
Scientific paper
Single-spin asymmetries were long thought to vanish in high-energy scattering processes because of their specific time-reversal behavior. Time-reversal-odd phenomena, however, appear naturally when one includes effects of intrinsic transverse momenta of partons. The partons, quarks and gluons, enter the description of high-energy scattering processes in correlators which contain quark and gluon fields. The correlators, parameterized in terms of distribution and fragmentation functions, constitute matrix elements of non-local field configurations. For transverse momentum dependent (TMD) correlators the non-locality is along a light-front, in contrast to the non-locality along the light-cone for collinear correlators, integrated over transverse momenta. The TMD correlators require a careful treatment to assure color gauge invariance, leading to nontrivial gauge links connecting the parton fields. These 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, which has consequences for issues like universality and factorization.
No associations
LandOfFree
Time-reversal-odd phenomena in QCD does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Time-reversal-odd phenomena in QCD, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-reversal-odd phenomena in QCD will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-572768