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dc.contributor.authorPHENIX Collaboration
dc.contributor.authorKim, Dong Jo
dc.contributor.authorRak, Jan
dc.date.accessioned2018-12-05T11:23:20Z
dc.date.available2018-12-05T11:23:20Z
dc.date.issued2018fi
dc.identifier.citationPHENIX Collaboration. (2018). Low-momentum direct-photon measurement in Cu + Cu collisions at √ sNN = 200 GeV. <em>Physical Review C</em>, 98 (5), 054902. <a href="https://doi.org/10.1103/PhysRevC.98.054902">doi:10.1103/PhysRevC.98.054902</a>fi
dc.identifier.otherTUTKAID_79629
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/60502
dc.description.abstractWe measured direct photons for pT < 5 GeV/c in minimum bias and 0%–40% most-central events at midrapidity for Cu+Cu collisions at √sNN = 200 GeV. The e+e− contribution from quasireal direct virtual photons has been determined as an excess over the known hadronic contributions in the e+e− mass distribution. A clear enhancement of photons over the binary scaled p+p fit is observed for pT < 4 GeV/c in Cu+Cu data. The pT spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the p+p baseline are 285 ± 53(stat) ± 57(syst) MeV/c and 333 ± 72(stat) ± 45(syst) MeV/c for minimum bias and 0%–40% most-central events, respectively. The rapidity density, dN/dy, of photons demonstrates the same power law as a function of dNch/dη observed in Au+Au at the same collision energy.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.otherrelativistic heavy-ion collisionsfi
dc.titleLow-momentum direct-photon measurement in Cu + Cu collisions at √ sNN = 200 GeVfi
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201811234856
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2018-11-23T10:15:12Z
dc.description.reviewstatuspeerReviewed
dc.relation.issn2469-9985
dc.relation.numberinseries5
dc.relation.volume98
dc.type.versionpublishedVersion
dc.rights.copyright© PHENIX Collaboration, 2018
dc.rights.accesslevelopenAccessfi
dc.format.contentfulltext
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1103/PhysRevC.98.054902


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