Theoretical Aspects of Azimuthal and Transverse Spin Asymmetries

Details Theoretical Aspects of Azimuthal and Transverse Spin Asymmetries Theoretical Aspects of Azimuthal and Transverse Spin Asymmetries

2001-06-15

arxiv.org/abs/hep-ph/0106171v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages Latex, using sprocl.sty; Talk at the 9th International Workshop on Deep Inelastic Scattering and QCD (DIS2001), Bologn

Scientific paper

We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading (zeroth) order in a 1/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 N_c limit, restricted to the non-singlet case for the chiral-even functions.

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