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@MISC{Collaboration:250988,
      author       = {A Large Ion Collider {Experiment Collaboration} and {ALICE
                      Collaboration}},
      title        = {{M}easurement of the groomed jet radius and momentum
                      splitting fraction in pp and {P}b$-${P}b collisions at
                      $\sqrt{s_{{NN}}} = 5.02$ {T}e{V}},
      reportid     = {GSI-2023-00189},
      year         = {2022},
      note         = {Journal Article GSI record: GSI-2023-00151},
      abstract     = {This article presents groomed jet substructure measurements
                      in pp and Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV
                      with the ALICE detector. The soft drop grooming algorithm
                      provides access to the hard parton splittings inside a jet
                      by removing soft wide-angle radiation. We report the groomed
                      jet momentum splitting fraction, zg, and the (scaled)
                      groomed jet radius, θg. Charged-particle jets are
                      reconstructed at midrapidity using the anti-k$_T$ algorithm
                      with resolution parameters R = 0.2 and R = 0.4. In heavy-ion
                      collisions, the large underlying event poses a challenge for
                      the reconstruction of groomed jet observables, since
                      fluctuations in the background can cause groomed parton
                      splittings to be misidentified. By using strong grooming
                      conditions to reduce this background, we report these
                      observables fully corrected for detector effects and
                      background fluctuations for the first time. A narrowing of
                      the θg distribution in Pb-Pb collisions compared to pp
                      collisions is seen, which provides direct evidence of the
                      modification of the angular structure of jets in the
                      quark-gluon plasma. No significant modification of the zg
                      distribution in Pb-Pb collisions compared to pp collisions
                      is observed. These results are compared with a variety of
                      theoretical models of jet quenching, and provide constraints
                      on jet energy-loss mechanisms and coherence effects in the
                      quark-gluon plasma.},
      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.128137},
      url          = {https://repository.gsi.de/record/250988},
}