Determination of the Collins-Soper Kernel from Lattice QCD

A bstract 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...

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Veröffentlicht in:	The journal of high energy physics 2021-08, Vol.2021 (8), p.1-26, Article 4
Hauptverfasser:	Schlemmer, Maximilian, Vladimirov, Alexey, Zimmermann, Christian, Engelhardt, Michael, Schäfer, Andreas
Format:	Artikel
Sprache:	eng
Schlagworte:	Boundary conditions Classical and Quantum Gravitation CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Collaboration Elementary Particles Fermions High energy physics Kernels Lattice QCD Partons Physics Physics and Astronomy Quantum chromodynamics Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Theoretical Physics Relativity Theory Resummation Simulation String Theory Transverse momentum
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Zusammenfassung:	A bstract 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 N f = 2 + 1 clover fermions for the CLS ensemble H101 ( a = 0 . 0854 fm, m π = m K = 422 MeV). The computed CS kernel is in good agreement with experimental extractions and previous lattice studies.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP08(2021)004