2008/04/30 by The PHENIX Collaboration, A. Adare, S. Afanasiev +100 · 12 citations
Arts and Humanities · Engineering · Physics and Astronomy · Social Sciences · #Art #Cultural and political discourse analysis #High-Energy Particle Collisions Research #Humanities #Latin American Literature Analysis #Latin American Literature Studies #Nuclear reactor physics and engineering #Particle physics theoretical and experimental studies #Physics #Production (economics) #nucl-ex
paper · pdf · doi:10.1103/physrevlett.104.132301
published as Phys.Rev.Lett.104:132301,2010 · 421 authors from 58 inst., 6 p., 4 figs. Sub. to PRL. v2 has minor changes to title, astract, and text. Data points for mass spectra are moved insignificantly. Expanded version submitted to PRC and arXiv:0912.0244. Plain text data tables are at http://www.phenix.bnl.gov/papers.html
arxiv created 2009/12/22 · arxiv updated 2010/05/12 · openalex publication_date 2012/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/11
The production of e+ e- pairs for m(e+ e-)<0.3 GeV/c2 and 1<p(T)<5 GeV/c is measured in p+p and Au+Au collisions at square root(S(NN))=200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au+Au collisions, the excess of the direct photon yield over p+p is exponential in transverse momentum, with an inverse slope T=221+/-19(stat)+/-19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T(init) approximately 300-600 MeV at times of approximately 0.6-0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at approximately 170 MeV.