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dc.contributor.authorALICE Collaboration
dc.contributor.authorChang, BeomSu
dc.contributor.authorKim, Dong Jo
dc.contributor.authorParkkila, Jasper
dc.contributor.authorRak, Jan
dc.contributor.authorRäsänen, Sami
dc.contributor.authorSlupecki, Maciej
dc.contributor.authorSnellman, Tomas
dc.contributor.authorTrzaska, Wladyslaw
dc.contributor.authorVargyas, Márton
dc.contributor.authorViinikainen, Jussi
dc.date.accessioned2018-10-30T09:49:14Z
dc.date.available2018-10-30T09:49:14Z
dc.date.issued2018fi
dc.identifier.citationALICE Collaboration. (2018). Medium modification of the shape of small-radius jets in central Pb-Pb collisions at sNN−−−√=2.76 TeV. <em>Journal of High Energy Physics</em>, 2018 (10), 139. <a href="https://doi.org/10.1007/jhep10(2018)139">doi:10.1007/jhep10(2018)139</a>fi
dc.identifier.otherTUTKAID_79285
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/60013
dc.description.abstractWe present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at sNN−−−√=2.76 TeV. The set of jet shapes includes the first radial moment or angularity, g; the momentum dispersion, pTD; 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 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.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofseriesJournal of High Energy Physics
dc.rightsIn Copyright
dc.subject.otherhiukkasfysiikkafi
dc.subject.otherheavy ion experimentsfi
dc.titleMedium modification of the shape of small-radius jets in central Pb-Pb collisions at sNN−−−√=2.76 TeVfi
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201810254527
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2018-10-25T09:15:14Z
dc.description.reviewstatuspeerReviewed
dc.relation.issn1126-6708
dc.relation.numberinseries10
dc.relation.volume2018
dc.type.versionpublishedVersion
dc.rights.copyright© The Author(s) 2018
dc.rights.accesslevelopenAccessfi
dc.format.contentfulltext
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1007/jhep10(2018)139


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