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@ARTICLE{Acharya:218245,
      author       = {Acharya, Shreyasi and others},
      title        = {{M}edium modification of the shape of small-radius jets in
                      central {P}b-{P}b collisions at $\sqrt{s_{\mathrm {{NN}}}} =
                      2.76\,\rm{{T}e{V}}$},
      journal      = {Journal of high energy physics},
      volume       = {2018},
      number       = {10},
      issn         = {1029-8479},
      address      = {[Trieste]},
      publisher    = {SISSA},
      reportid     = {GSI-2019-00225},
      pages        = {139},
      year         = {2018},
      note         = {26 pages, 8 captioned figures, 2 tables, authors from page
                      21, published, figures at
                      http://alice-publications.web.cern.ch/node/4505 ;
                      publication: JHEP 1810 (2018) 139 ; "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     = {We present the measurement of a new set of jet shape
                      observables for track-based jets in central Pb-Pb collisions
                      at $ \sqrt{s_{\mathrm{NN}}}=2.76 $ TeV. The set of jet
                      shapes includes the first radial moment or angularity, g,
                      the momentum dispersion, p$_{T}$D, and the difference
                      between the leading and sub-leading constituent track
                      transverse momentum, LeSub. These observables provide
                      complementary information on the jet fragmentation and can
                      constrain different aspects of the theoretical description
                      of jet-medium interactions. The jet shapes were measured for
                      a small resolution parameter R = 0.2 and were fully
                      corrected to particle level. The observed jet shape
                      modifications indicate that in-medium fragmentation is
                      harder and more collimated than vacuum fragmentation as
                      obtained by PYTHIA calculations, which were validated with
                      the measurements of the jet shapes in proton-proton
                      collisions at $ \sqrt{s}=7 $ TeV. The comparison of the
                      measured distributions to templates for quark and
                      gluon-initiated jets indicates that in-medium fragmentation
                      resembles that of quark jets in vacuum. We further argue
                      that the observed modifications are not consistent with a
                      totally coherent energy loss picture where the jet loses
                      energy as a single colour charge, suggesting that the medium
                      resolves the jet structure at the angular scales probed by
                      our measurements (R = 0.2). Furthermore, we observe that
                      small-R jets can help to isolate purely energy loss effects
                      from other effects that contribute to the modifications of
                      the jet shower in medium such as the correlated background
                      or medium response.},
      keywords     = {heavy ion: scattering (autogen) / jet: fragmentation
                      (autogen) / quark: jet (autogen) / showers: jet (autogen) /
                      tracks: transverse momentum (autogen) / momentum: dispersion
                      (autogen) / matter: effect (autogen) / charge: color
                      (autogen) / p p: scattering (autogen) / energy loss
                      (autogen) / constituent (autogen) / collimator (autogen) /
                      background (autogen) / resolution (autogen) / coherence
                      (autogen) / structure (autogen) / moment (autogen) / PYTHIA
                      (autogen)},
      cin          = {ALI / DTL / CIT / EXM},
      ddc          = {530},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF3-612) /
                      HGF-IVF-VH-GS-201 - HGS-HIRe : (HGF-IVF-VH-GS-201) /
                      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) / OAGSI - Open Access Publikation mit
                      Unterstützung des GSI Helmholtzzentrums für
                      Schwerionenforschung (OAGSI)},
      pid          = {G:(DE-HGF)POF3-612 / G:(DE-Ds200)HGF-IVF-VH-GS-201 /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA / G:(DE-Ds200)OAGSI},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {1807.06854},
      howpublished = {arXiv:1807.06854},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1807.06854;\%\%$},
      UT           = {WOS:000448284300001},
      doi          = {10.1007/JHEP10(2018)139},
      url          = {https://repository.gsi.de/record/218245},
}