Abstract
We present an extraction of unpolarized transverse momentum dependent parton distributions functions (TMDPDFs) and Collins-Soper kernel from the fit of Drell-Yan and weak-vector boson production data. The TMDPDF are parameterized, as commonly done, using their (large transverse momentum) asymptotic matching to PDF. The analysis is done at the next-to-next-to-next-to-next-to leading logarithmic accuracy (N4LL) (performed only approximately because PDF evolution is known so far at next-to-next-to leading order (NNLO)). The non-perturbative model used for TMDPDF is flavor dependent to reduce the colllinear PDF bias. The estimation of uncertainties is done with the replica method and, for the first time, it includes the propagation of uncertainties due to the collinear distributions.
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Acknowledgments
We thank the STAR collaboration, explicitly Salvatore Fazio and Xiaoxuan Chu, for sharing their preliminary results with us, such that these data could be included in the fit. We also thank Louis Moureaux and Buğra Bilin for their help with the interpretation of the CMS Q-differential data. A.V. is funded by the Atracción de Talento Investigador program of the Comunidad de Madrid (Spain) No. 2020-T1/TIC-20204 and Europa Excelencia EUR2023-143460 from Spanish Ministerio de Ciencias y Innovación. P.Z. is funded by the Atracción de Talento Investigador program of the Comunidad de Madrid (Spain) No. 2022-T1/TIC-24024. This work was partially supported by DFG FOR 2926 “Next Generation pQCD for Hadron Structure: Preparing for the EIC”, project number 430824754. This project is supported by the Spanish Ministerio de Ciencias y Innovación grant PID2019-106080GB-C21 and PID2022-136510NB-C31. This project has received funding from the European Union Horizon 2020 research and innovation program under grant agreement Num. 824093 (STRONG-2020).
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Moos, V., Scimemi, I., Vladimirov, A. et al. Extraction of unpolarized transverse momentum distributions from the fit of Drell-Yan data at N4LL. J. High Energ. Phys. 2024, 36 (2024). https://doi.org/10.1007/JHEP05(2024)036
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DOI: https://doi.org/10.1007/JHEP05(2024)036