RT Journal Article T1 Determination of the Collins-Soper kernel from cross-sections ratios A1 Bermúdez Martínez, Armando A1 Vladimirov, Alexey AB The Collins-Soper kernel is a powerful tool for studying the properties of the QCD vacuum and an essential component of the transverse momentum dependent (TMD) factorization theorem. In this paper, we present a novel method for determining the Collins-Soper kernel directly from the comparison of differential cross sections measured at different energies. The method relies solely on the structure of the TMD factorization theorem and thus also provides a direct test of the theorem validity. With minor modifications, the procedure can be applied to the real measured data for Drell-Yan and SIDIS processes. As a demonstration, we analyze the pseudodata generated by the CASCADE event generator and determine the Collins-Soper kernel suggested by the parton branching model. PB Amer Physical Soc SN 2470-0010 YR 2022 FD 2022-11-02 LK https://hdl.handle.net/20.500.14352/73033 UL https://hdl.handle.net/20.500.14352/73033 LA eng NO © 2002 Amer Physical SocWe thank Hannes Jung and Francesco Hautmann for discussions, and also Qi-An Zhang and Alessandro Bacchetta for providing us with their extractions. A. V. is funded by the Atraccion de Talento Investigador program of the Comunidad de Madrid (Spain) No. 2020-T1/TIC -20204. This work was partially supported by DFG FOR 2926 Next Generation pQCD for Hadron Structure: Preparing for the EIC , Project No. 430824754 NO Comunidad de Madrid NO German Research Foundation (DFG) DS Docta Complutense RD 11 abr 2025