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Theoretical aspects of azimuthal and transverse spin asymmetries.

DE2001783982

Publication Date	2001
Personal Author	Mulders, ; Henneman, ; Boer,
Page Count	6
Abstract	We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading (zeroth) order in a l/Q expansion in azimuthal asymmetries. This includes the evolution equation of the Collins fragmentation function. The moments of these functions are matrix elements of known twist two and twist three operators. We present the evolution in the large NC limit, restricted to the non-singlet case for the chiral-even functions.
Keywords	Lorentz invariance Quantum chromodynamics Spin Deep inelastic scattering Equations of motion Fragmentation Matrix elements Chiral symmetry
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	AC02-98CH10886

Theoretical aspects of azimuthal and transverse spin asymmetries.

Theoretical aspects of azimuthal and transverse spin asymmetries.
DE2001783982

Publication Date	2001
Personal Author	Mulders, ; Henneman, ; Boer,
Page Count	6
Abstract	We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading (zeroth) order in a l/Q expansion in azimuthal asymmetries. This includes the evolution equation of the Collins fragmentation function. The moments of these functions are matrix elements of known twist two and twist three operators. We present the evolution in the large NC limit, restricted to the non-singlet case for the chiral-even functions.
Keywords	Lorentz invariance Quantum chromodynamics Spin Deep inelastic scattering Equations of motion Fragmentation Matrix elements Chiral symmetry
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	AC02-98CH10886