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@ARTICLE{Jung:626261,
      author       = {Jung, Hannes and Lönnblad, L. and Mendizabal, M. and
                      Taheri Monfared, S.},
      title        = {{A} parton shower consistent with parton densities at {LO}
                      and {NLO}: {PDF}2{ISR}},
      reportid     = {PUBDB-2025-01341, DESY-25-062. arXiv:2504.10243.
                      MCNET-25-06},
      year         = {2025},
      abstract     = {We present a method for obtaining an initial-state parton
                      shower model where the (backward) evolution fully consistent
                      with the (forward) evolution of the collinear parton density
                      used. As a proof-of-concept we use parton densities obtained
                      with the Parton Branching (PB) approach, and modify the
                      default initial-state shower in PYTHIA8 with this method to
                      be consistent with them. PB is ideally suited for checking
                      the validity of our method since, in addition to producing
                      collinear parton densities, it also produces the
                      corresponding transverse-dependent (TMD) ones, and these can
                      then be directly compared to the transverse momentum
                      distribution obtained from the parton shower. We show that
                      TMD distributions which we in this way obtain from our
                      modified PYTHIA8 shower using leading order (LO) parton
                      densities and splitting functions are fully consistent with
                      the corresponding leading order TMD densities. At
                      next-to-leading order (NLO) it is not possible to achieve
                      the same consistency using the built-in LO splitting
                      functions in the shower, but we show that by introducing NLO
                      splitting functions using a reweighting procedure, we can
                      achieve consistency also at NLO. The method presented here,
                      which we have named PDF2ISR, can be easily extended to any
                      collinear parton densities, as long as the exact conditions
                      for the evolution are known. With the PDF2ISR method we
                      obtain an initial-state parton shower which in principle has
                      no free parameters, and is fully consistent with collinear
                      parton densities at LO and NLO.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)467467041 - Ein neuer Ansatz für
                      Präzisionsberechnungen von harten Streuprozessen am LHC und
                      zukünftigen Beschleunigern unter Verwendung von Parton
                      Branching Transversalimpuls Verteilungen (PB-app)
                      (467467041)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)467467041},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2504.10243},
      howpublished = {arXiv:2504.10243},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2504.10243;\%\%$},
      doi          = {10.3204/PUBDB-2025-01341},
      url          = {https://bib-pubdb1.desy.de/record/626261},
}