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arXiv · 2502.19380

Collinear and TMD distributions with dynamical soft-gluon resolution scale

F. Hautmann·L. Keersmaekers·A. Lelek·S. Sadeghi Barzani·S. Taheri Monfared
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Abstract

Soft-gluon resolution scales characterize parton branching Monte Carlo implementations of the evolution equations for parton distribution functions in Quantum Chromodynamics (QCD). We examine scenarios with dynamical, i.e., branching-scale dependent, resolution scale, and discuss physical implications for both collinear and transverse-momentum dependent (TMD) distributions. We perform the first determination of parton distributions with dynamical resolution scale, at next-to-leading order (NLO) in perturbation theory, from fits to precision deep-inelastic scattering measurements from HERA. We present an application of TMD distributions with dynamical resolution scale to Drell-Yan lepton-pair transverse momentum spectra at the LHC, and comment on the extraction of non-perturbative intrinsic-kT parameters from Drell-Yan data at small transverse momenta.

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F. Hautmann, L. Keersmaekers, A. Lelek, S. Sadeghi Barzani, S. Taheri Monfared. 2025-07-10. Collinear and TMD distributions with dynamical soft-gluon resolution scale. https://doi.org/10.1007/jhep06(2025)192

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