Detailed measurement of the e(+)e(-) pair continuum in p plus p and Au plus Au collisions at root s(NN)=200 GeV and implications for direct photon production

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dc.contributor.author Adare, Andrew
dc.contributor.author Ogilvie, Craig
dc.contributor.author Belikov, Sergey
dc.contributor.author Constantin, Paul
dc.contributor.author Grau, Nathan
dc.contributor.author Hill, John
dc.contributor.author Lajoie, John
dc.contributor.author Lebedev, Alexandre
dc.contributor.author Ogilvie, Craig
dc.contributor.author Pei, H.
dc.contributor.author Rak, Jan
dc.contributor.author Rosati, Marzia
dc.contributor.author Skutnik, S.
dc.contributor.author Vale, Carla
dc.contributor.author et al.
dc.contributor.department Physics and Astronomy
dc.date 2018-02-18T13:12:22.000
dc.date.accessioned 2020-06-30T06:18:41Z
dc.date.available 2020-06-30T06:18:41Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2010
dc.date.issued 2010-03-01
dc.description.abstract <p>PHENIX has measured the e(+)e(-) pair continuum in root s(NN) = 200 GeV Au+Au and p+p collisions over a wide range of mass and transverse momenta. The e(+)e(-) yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate-mass region, between the masses of the phi and the J/psi meson, the yield is consistent with expectations from correlated c (c) over bar production, although other mechanisms are not ruled out. In the low-mass region, below the phi, the p+p inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of 4.7 +/- 0.4(stat) +/- 1.5(syst) +/- 0.9(model). At low mass (m(ee) < 0.3 GeV/c(2)) and high p(T) (1 < p(T) < 5 GeV/c) an enhanced e(+)e(-) pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the p+p is exponential in p(T), with inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar or equal to 300-600 MeV at times of 0.6-0.15 fm/c after the collision are in qualitative agreement with the direct photon data in Au+Au. For low p(T) < 1 GeV/c the low-mass region shows a further significant enhancement that increases with centrality and has an inverse slope of T similar or equal to 100 MeV. Theoretical models underpredict the low-mass, low-p(T) enhancement.</p>
dc.description.comments <p>This article is published as Adare, Ad, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Detailed measurement of the e+ e− pair continuum in p+ p and Au+ Au collisions at s NN= 200 GeV and implications for direct photon production." <em>Physical Review C</em> 81, no. 3 (2010): 034911. DOI:<a href="http://dx.doi.org/10.1103/PhysRevC.81.034911" target="_blank">10.1103/PhysRevC.81.034911</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/physastro_pubs/314/
dc.identifier.articleid 1309
dc.identifier.contextkey 10252073
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath physastro_pubs/314
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/57072
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/physastro_pubs/314/2010_Ogilvie_DetailedMeasurement.pdf|||Fri Jan 14 23:32:02 UTC 2022
dc.source.uri 10.1103/PhysRevC.81.034911
dc.subject.disciplines Nuclear
dc.subject.disciplines Physics
dc.title Detailed measurement of the e(+)e(-) pair continuum in p plus p and Au plus Au collisions at root s(NN)=200 GeV and implications for direct photon production
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 0c7465f3-a076-4319-9513-6cd51186bbf6
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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