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@ARTICLE{Bubanja:617812,
      author       = {Bubanja, I. and Jung, Hannes and Raicevic, N. and Taheri
                      Monfared, Sara},
      title        = {{I}nterplay of intrinsic motion of partons and soft gluon
                      emissions in {D}rell-{Y}an production studied with {PYTHIA}},
      reportid     = {PUBDB-2024-07073, DESY-24-182. arXiv:2412.05221},
      year         = {2024},
      abstract     = {Understanding the intrinsic transverse momentum
                      (intrinsic-$k_T$) of partons within colliding hadrons,
                      typically modeled with a Gaussian distribution characterized
                      by a specific width (the intrinsic-$k_T$ width), has been an
                      extremely challenging issue. This difficulty arises because
                      event generators like Pythia require an intrinsic-$k_T$
                      width that unexpectedly varies with collision energy,
                      reaching unphysical values at high energies. This paper
                      investigates the underlying physics behind this energy
                      dependence in Pythia, revealing that it arises from an
                      interplay between two non-perturbative processes: the
                      internal transverse motion of partons and non-perturbative
                      soft gluon emissions. These contributions are most
                      constrained in the production of Drell-Yan pairs with very
                      low transverse momentum, where soft gluon effects become
                      increasingly prominent with rising collision energy-contrary
                      to initial expectations. Through a detailed analysis of the
                      non-perturbative Sudakov form factor and its influence on
                      intrinsic-$k_T$ width, we clarify the observed energy
                      scaling behavior in Pythia, providing insight into a
                      longstanding issue in parton shower modeling.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      STRONG-2020 - The strong interaction at the frontier of
                      knowledge: fundamental research and applications (824093)},
      pid          = {G:(DE-HGF)POF4-611 / G:(EU-Grant)824093},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2412.05221},
      howpublished = {arXiv:2412.05221},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2412.05221;\%\%$},
      doi          = {10.3204/PUBDB-2024-07073},
      url          = {https://bib-pubdb1.desy.de/record/617812},
}