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<p>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 lower-energy experiments, and comment on the extraction of non-perturbative intrinsic-<i>k</i><sub><i>T</i></sub> parameters from Drell-Yan data at small transverse momenta.</p>

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Collinear and TMD distributions with dynamical soft-gluon resolution scale

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月19日

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  • F. Hautmann,
  • L. Keersmaekers,
  • A. Lelek,
  • S. Sadeghi Barzani,
  • S. Taheri Monfared

摘要

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 lower-energy experiments, and comment on the extraction of non-perturbative intrinsic-kT parameters from Drell-Yan data at small transverse momenta.