Final state interactions and gauge invariant parton distributions

Details Final state interactions and gauge invariant parton distributions Final state interactions and gauge invariant parton distributions

2002-08-05

arxiv.org/abs/hep-ph/0208038v2

Nucl.Phys. B656 (2003) 165-198

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, LaTeX, 10 figures

Scientific paper

10.1016/S0550-3213(03)00121-4

Parton distributions contain factorizable final state interaction effects originating from the fast-moving struck quark interacting with the target spectators in deeply inelastic scattering. We show that these interactions give rise to gauge invariance of the transverse momentum-dependent parton distributions. As compared to previous analyses, our study demonstrates the existence of extra scaling contributions from transverse components of the gauge potential at the light-cone infinity. They form a transverse gauge link which is indispensable for restoration of the gauge invariance of parton distributions in the light-cone gauge where the gauge potential does not vanish asymptotically. Our finding helps to explain a number of features observed in a model calculation of structure functions in the light-cone gauge.

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