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Measurement of dielectron production in central Pb-Pb collisions at sNN =2.76 TeV

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dc.contributor.authorAcharya, S.
dc.contributor.authorAcosta, F. T.
dc.contributor.authorAdamova, D.
dc.contributor.authorAdolfsson, J.
dc.contributor.authorBelyaev, V.
dc.contributor.authorBogdanov, A.
dc.contributor.authorGrigoriev, V.
dc.contributor.authorKaplin, V.
dc.contributor.authorKondratyeva, N.
dc.contributor.authorLoginov, V.
dc.contributor.authorMelikyan, Y.
dc.contributor.authorSamsonov, V.
dc.contributor.authorSelyuzhenkov, I.
dc.contributor.authorБеляев, Владимир Никитич
dc.contributor.authorБогданов, Алексей Александрович
dc.contributor.authorГригорьев, Владислав Анатольевич
dc.contributor.authorКондратьева, Наталья Викторовна
dc.contributor.authorЛогинов, Виталий Александрович
dc.date.accessioned2024-11-20T09:37:28Z
dc.date.available2024-11-20T09:37:28Z
dc.date.issued2019
dc.description.abstract© 2019 CERN. The first measurement of dielectron (e+e-) production in central (0-10%) Pb-Pb collisions at sNN=2.76TeV 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<mee<3.5GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15<mee<0.7GeV/c2, 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<mee<1GeV/c2 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 ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1<mee<0.3GeV/c2 and in the transverse-momentum intervals 1<pT,ee<2GeV/c and 2<pT,ee<4GeV/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.
dc.identifier.citationMeasurement of dielectron production in central Pb-Pb collisions at sNN =2.76 TeV / Acharya, S. [et al.] // Physical Review C. - 2019. - 99. - № 2. - 10.1103/PhysRevC.99.024002
dc.identifier.doi10.1103/PhysRevC.99.024002
dc.identifier.urihttps://www.doi.org/10.1103/PhysRevC.99.024002
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85061824484&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000458816200001
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/16576
dc.relation.ispartofPhysical Review C
dc.titleMeasurement of dielectron production in central Pb-Pb collisions at sNN =2.76 TeV
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue2
oaire.citation.volume99
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