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arXiv · 2502.15033

Unveiling the Collins-Soper kernel in inclusive DIS at threshold

Andrea Simonelli·Alberto Accardi·Matteo Cerutti·Caroline S. R. Costa·Andrea Signori
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Abstract

We revisit the factorization of inclusive deep inelastic scattering near the kinematic threshold to explicitly track off-lightcone effects. Particle production develops around two opposite near-lightcone directions like in transverse-momentum-dependent processes, and the Collins-Soper kernel emerges as a universal function in the rapidity evolution of the relevant parton correlators. We clarify outstanding issues regarding soft radiation and rapidity divergences, and uncover a new way to calculate the Collins-Soper kernel on the lattice with collinear operators.

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Andrea Simonelli, Alberto Accardi, Matteo Cerutti, Caroline S. R. Costa, Andrea Signori. 2025-02-20. Unveiling the Collins-Soper kernel in inclusive DIS at threshold. https://arxiv.org/abs/2502.15033

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