Non-perturbative contributions to vector-boson transverse momentum spectra in hadronic collisions

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Experimental measurements of Drell-Yan (DY) vector-boson production are available from the Large Hadron Collider (LHC) and from lower-energy collider and fixed-target experiments. In the region of low vector-boson transverse momenta q(T), which is important for the extraction of the W-boson mass at the LHC, QCD contributions from non-perturbative Sudakov form factors and intrinsic transverse momentum distributions become relevant. We study the potential for determining such contributions from fits to LHC and lower-energy experimental data, using the framework of low-q(T) factorization for DY differential cross sections in terms of transverse momentum dependent (TMD) distribution functions. We investigate correlations between different sources of TMD non-perturbative effects, and correlations with collinear parton distributions. We stress the relevance of accurate DY measurements at low masses and with fine binning in transverse momentum for improved determinations of long-distance contributions to Sudakov evolution processes and TMDs. (C) 2020 The Author(s). Published by Elsevier B.V.
© 2020 The Author(s). We thank the participants of the "Resummation, Evolution, Factorization" workshops in Krakow (November 2018) and Pavia (November 2019) for lively discussions on the topics of this work. F.H. acknowledges the support and hospitality of DESY, Hamburg while part of this work was being done. I.S. is supported by the Spanish MECD grant FPA2016-75654-C2-2-P. A.V. is supported by DFG grant N. 430824754 as a part of the Research Unit FOR 2926. This project has received funding from the European Union Horizon 2020 research and innovation program under grant agreement No 824093 (STRONG-2020).
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