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arxiv: hep-ph/0104271 · v1 · submitted 2001-04-25 · ✦ hep-ph

Evolution of transverse momentum dependent distribution and fragmentation functions

classification ✦ hep-ph
keywords evolutionfunctionsfragmentationtwistappearasymmetriesazimuthalchiral-even
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We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading 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, restricting to non-singlet for the chiral-even functions.

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  1. Introduction to transverse momentum imaging

    hep-ph 2026-04 unverdicted

    The notes provide an introduction to transverse momentum dependent distributions and their use in imaging hadrons, complementing lectures at several graduate schools.