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arXiv · hep-ph/0208038

Final state interactions and gauge invariant parton distributions

A. V. Belitsky·X. Ji·F. Yuan
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Abstract

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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A. V. Belitsky, X. Ji, F. Yuan. 2002-11-19. Final state interactions and gauge invariant parton distributions. https://doi.org/10.1016/s0550-3213(03)00121-4

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