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@ARTICLE{Belyaev:646490,
      author       = {Belyaev, Andrey and others},
      collaboration = {{CMS Collaboration}},
      title        = {{P}robing early parton emissions in heavy ion collisions
                      using the {L}und jet plane},
      reportid     = {PUBDB-2026-00877, arXiv:2602.09271. CMS-HIN-24-016.
                      CERN-EP-2025-260},
      year         = {2026},
      note         = {Submitted to Physical Review Letters. All figures and
                      tables can be found at
                      http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-24-016
                      (CMS Public Pages)},
      abstract     = {In scattering experiments, high-virtuality partons, i.e.,
                      quarks and gluons, initiate a series of additional parton
                      emissions to create collimated sprays of particles known as
                      jets. This paper presents a measurement of the Lund jet
                      plane (LJP) of high-energy jets produced in lead-lead (PbPb)
                      collisions and compares the results to data for
                      proton-proton (pp) collisions. The LJP is formed by
                      iteratively declustering the constituents of a jet into
                      consecutive emissions and recording the relative transverse
                      momentum ($k_\mathrm{T}$) and angle of the resulting
                      emission with respect to its emitter. The angular
                      distributions of two different $k_\mathrm{T}$ slices of the
                      LJP are investigated for jets with radius parameter of 0.4
                      and transverse momentum in the range 200$-$1000 GeV. The
                      PbPb (pp) data were recorded by the CMS experiment in 2018
                      (2017) and correspond to an integrated luminosity of 1.7
                      nb$^{-1}$ (301 pb$^{-1}$) at a nucleon-nucleon
                      center-of-mass energy of 5.02 TeV. The measurement was
                      designed to test whether the earliest jet emissions are
                      produced before the formation of the quark-gluon plasma
                      (QGP) in PbPb collisions. Within the experimental
                      uncertainties, no significant difference is observed between
                      the angular distribution of high-$k_\mathrm{T}$ emissions in
                      \pp and PbPb collisions, which is consistent with these
                      emissions occurring early in the jet evolution, before
                      substantial interaction with the QGP.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      HIDSS-0002 - DASHH: Data Science in Hamburg - Helmholtz
                      Graduate School for the Structure of Matter
                      $(2019_IVF-HIDSS-0002)$ / DFG project G:(GEPRIS)390833306 -
                      EXC 2121: Das Quantisierte Universum II (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / $G:(DE-HGF)2019_IVF-HIDSS-0002$ /
                      G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2602.09271},
      howpublished = {arXiv:2602.09271},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2602.09271;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/646490},
}