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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.accessioned2019-03-14T11:56:59Z
dc.date.available2019-03-14T11:56:59Z
dc.date.issued2019fi
dc.identifier.citationALICE Collaboration. (2019). Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV. <em>Physical Review C</em>, 99 (2), 024002. <a href="https://doi.org/10.1103/PhysRevC.99.024002">doi:10.1103/PhysRevC.99.024002</a>fi
dc.identifier.otherTUTKAID_80971
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/63126
dc.description.abstractThe first measurement of dielectron ( e + e − ) production in central ( 0 – 10 % ) Pb–Pb collisions at √ s NN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < m ee < 3.5 GeV / c 2 . The ratio of data and the cocktail of hadronic contributions without vacuum ρ 0 is measured in the invariant-mass range 0.15 < m ee < 0.7 GeV / c 2 , where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 ( stat . ) ± 0.08 ( syst . ) ± 0.27 ( cocktail ) . The dielectron spectrum measured in the invariant mass range 0 < m ee < 1 GeV / c 2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ 0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < m ee < 0.3 GeV / c 2 and in the transverse-momentum intervals 1 < p T , ee < 2 GeV / c and 2 < p T , ee < 4 GeV / c . The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review C
dc.rightsCC BY 4.0
dc.subject.otherhiukkasfysiikkafi
dc.subject.otherheavy ion collisionsfi
dc.subject.otherdielectron productionfi
dc.titleMeasurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeVfi
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201903131858
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2019-03-13T16:15:14Z
dc.description.reviewstatuspeerReviewed
dc.relation.issn2469-9985
dc.relation.numberinseries2
dc.relation.volume99
dc.type.versionpublishedVersion
dc.rights.copyright© 2019 CERN, for the ALICE Collaboration.
dc.rights.accesslevelopenAccessfi
dc.format.contentfulltext
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1103/PhysRevC.99.024002


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