https://doi.org/10.1140/epjc/s10052-024-12507-0
Regular Article - Theoretical Physics
The small 
region in Drell–Yan production at next-to-leading order with the parton branching method
1
Faculty of Science and Mathematics, University of Montenegro, Podgorica, Montenegro
2
Interuniversity Institute for High Energies (IIHE), Université libre de Bruxelles, Brussels, Belgium
3
CERN, Geneva, Switzerland
4
InSTEC, Universidad de La Habana, Havanna, Cuba
5
Elementary Particle Physics, University of Antwerp, Antwerp, Belgium
6
University of Oxford, Oxford, UK
7
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
8
II. Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany
9
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
10
Riga Technical University, Riga, Latvia
Received:
15
December
2023
Accepted:
29
January
2024
Published online:
15
February
2024
The Parton Branching (PB) method describes the evolution of transverse momentum dependent (TMD) parton distributions, covering all kinematic regions from small to large transverse momenta . The small -region is very sensitive both to the contribution of the intrinsic motion of partons (intrinsic ) and to the resummation of soft gluons taken into account by the PB TMD evolution equations. We study the role of soft-gluon emissions in TMD as well as integrated parton distributions. We perform a detailed investigation of the PB TMD methodology at next-to-leading order (NLO) in Drell–Yan (DY) production for low transverse momenta. We present the extraction of the nonperturbative “intrinsic- ” distribution from recent measurements of DY transverse momentum distributions at the LHC across a wide range in DY masses, including a detailed treatment of statistical, correlated and uncorrelated uncertainties. We comment on the (in)dependence of intrinsic transverse momentum on DY mass and center-of-mass energy, and on the comparison with other approaches.
© The Author(s) 2024
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Funded by SCOAP3.
