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@ARTICLE{Acharya:245778,
      author       = {Acharya, Shreyasi and others},
      title        = {{F}irst measurements of ${N}$-subjettiness in central
                      {P}b$-${P}b collisions at ${\sqrt{\it{s}_{\rm {{NN}}}}} =
                      2.76$ {T}e{V}},
      journal      = {Journal of high energy physics},
      volume       = {10},
      number       = {10},
      issn         = {1029-8479},
      address      = {[Trieste]},
      publisher    = {SISSA},
      reportid     = {GSI-2022-00098, arXiv:2105.04936. CERN-EP-2021-082},
      pages        = {3},
      year         = {2021},
      note         = {JHEP 10 (2021) 003. 29 pages, 7 captioned figures, 2
                      tables, authors from page 24, published version, figures at
                      http://alice-publications.web.cern.ch/node/7072 " This
                      article is distributed under the terms of the Creative
                      Commons Attribution License (CC-BY 4.0), which permits any
                      use, distribution and reproduction in any medium, provided
                      the original author(s) and source are credited."},
      abstract     = {The ALICE Collaboration reports the first fully-corrected
                      measurements of the $N$-subjettiness observable for
                      track-based jets in heavy-ion collisions. This study is
                      performed using data recorded in pp and Pb$-$Pb collisions
                      at centre-of-mass energies of $\sqrt{s} = 7$ TeV and
                      $\sqrt{s_{\rm NN}} = 2.76$ TeV, respectively. In particular
                      the ratio of 2-subjettiness to 1-subjettiness,
                      $\tau_{2}/\tau_{1}$, which is sensitive to the rate of
                      two-pronged jet substructure, is presented. Energy loss of
                      jets traversing the strongly interacting medium in heavy-ion
                      collisions is expected to change the rate of two-pronged
                      substructure relative to vacuum. The results are presented
                      for jets with a resolution parameter of $R = 0.4$ and
                      charged jet transverse momentum of $40 \leq p_{\rm T,\rm
                      jet} \leq 60$ GeV/$c$, which constitute a larger jet
                      resolution and lower jet transverse momentum interval than
                      previous measurements in heavy-ion collisions. This has been
                      achieved by utilising a semi-inclusive hadron-jet
                      coincidence technique to suppress the larger jet
                      combinatorial background in this kinematic region. No
                      significant modification of the $\tau_{2}/\tau_{1}$
                      observable for track-based jets in Pb--Pb collisions is
                      observed relative to vacuum PYTHIA6 and PYTHIA8 references
                      at the same collision energy. The measurements of
                      $\tau_{2}/\tau_{1}$, together with the splitting aperture
                      angle $\Delta R$, are also performed in pp collisions at
                      $\sqrt{s}=7$ TeV for inclusive jets. These results are
                      compared with PYTHIA calculations at $\sqrt{s}=7$ TeV, in
                      order to validate the model as a vacuum reference for the
                      Pb$-$Pb centre-of-mass energy. The PYTHIA references for
                      $\tau_{2}/\tau_{1}$ are shifted to larger values compared to
                      the measurement in pp collisions. This hints at a reduction
                      in the rate of two-pronged jets in Pb--Pb collisions
                      compared to pp collisions.},
      keywords     = {jet: transverse momentum (INSPIRE) / beam: width (INSPIRE)
                      / jet: energy loss (INSPIRE) / heavy ion: scattering
                      (INSPIRE) / jet: resolution (INSPIRE) / p p: scattering
                      (INSPIRE) / PYTHIA (INSPIRE) / structure (INSPIRE) /
                      semi-inclusive reaction (INSPIRE) / ALICE (INSPIRE) /
                      kinematics (INSPIRE) / experimental results (INSPIRE) / 2760
                      GeV-cms/nucleon (INSPIRE) / 7000 GeV-cms/nucleon (INSPIRE)},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      ddc          = {530},
      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)16},
      eprint       = {2105.04936},
      howpublished = {arXiv:2105.04936},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2105.04936;\%\%$},
      UT           = {WOS:000703983100001},
      doi          = {10.1007/JHEP10(2021)003},
      url          = {https://repository.gsi.de/record/245778},
}