Abstract
We present lattice results for the non-perturbative Collins-Soper (CS) kernel, which describes the energy-dependence of transverse momentum-dependent parton distributions (TMDs). The CS kernel is extracted from the ratios of first Mellin moments of quasi-TMDs evaluated at different nucleon momenta. The analysis is done with dynamical Nf = 2 + 1 clover fermions for the CLS ensemble H101 (a = 0.0854 fm, mπ = mK = 422 MeV). The computed CS kernel is in good agreement with experimental extractions and previous lattice studies.
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Schlemmer, M., Vladimirov, A., Zimmermann, C. et al. Determination of the Collins-Soper Kernel from Lattice QCD. J. High Energ. Phys. 2021, 4 (2021). https://doi.org/10.1007/JHEP08(2021)004
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DOI: https://doi.org/10.1007/JHEP08(2021)004