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@MISC{Collaboration:348356,
      author       = {{ALICE Collaboration}},
      title        = {{M}easurements of groomed-jet substructure of charm jets
                      tagged by ${\rm {D}}^0$ mesons in proton-proton collisions
                      at $\sqrt{s}$ = 13 {T}e{V}},
      reportid     = {GSI-2024-00192},
      year         = {2023},
      note         = {Journal Article GSI record: GSI-2024-00191},
      abstract     = {Understanding the role of parton mass and Casimir colour
                      factors in the quantum chromodynamics parton shower
                      represents an important step in characterising the emission
                      properties of heavy quarks. Recent experimental advances in
                      jet substructure techniques have provided the opportunity to
                      isolate and characterise gluon emissions from heavy quarks.
                      In this work, the first direct experimental constraint on
                      the charm-quark splitting function is presented, obtained
                      via the measurement of the groomed shared momentum fraction
                      of the first splitting in charm jets, tagged by a
                      reconstructed D$^{0}$ meson. The measurement is made in
                      proton--proton collisions at $\sqrt{s} = 13$ TeV, in the low
                      jet transverse-momentum interval of $15 \leq p_{\rm{T}}^{jet
                      ch} < 30$ GeV/$c$ where the emission properties are
                      sensitive to parton mass effects. In addition, the opening
                      angle of the first perturbative emission of the charm quark,
                      as well as the number of perturbative emissions it
                      undergoes, are reported. Comparisons to measurements of an
                      inclusive-jet sample show a steeper splitting function for
                      charm quarks compared to gluons and light quarks. Charm
                      quarks also undergo fewer perturbative emissions in the
                      parton shower, with a reduced probability of large-angle
                      emissions.},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
                      - HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
                      Strategic university cooperation GSI-U Heidelberg
                      (SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
                      cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
                      SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
                      Darmstadt (SUC-GSI-DA)},
      pid          = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)32},
      doi          = {10.17182/HEPDATA.142594},
      url          = {https://repository.gsi.de/record/348356},
}