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26 April 2024

» pubmed » pmid11030959

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Observation of direct photons in central 158A GeV (208)P(208)b+Pb collisions
S Nikolaev ; P Nilsson ; S Nishimura ; P Nomokonov ; J Nystr ; F E Obenshain ; A Oskarsson ; I Otterlund ; M Pachr ; S Pavliouk ; T Peitzmann ; V Petracek ; W Pinganaud ; F Plasil ; U Poblotzki ; M L Purschke ; J Rak ; R Raniwala ; S Raniwala ; V S Ramamurthy ; N K Rao ; F Retiere ; K Reygers ; G Rol ; L Rosselet ; I Roufanov ;
Date:	23 Oct 2000
Journal:	Phys Rev Lett, 85 (17), 3595-9
Abstract:	A measurement of direct photon production in 208Pb+208Pb collisions at 158A GeV has been carried out in the CERN WA98 experiment. The invariant yield of direct photons in central collisions is extracted as a function of transverse momentum in the interval 0.5<p(T)<4 GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at p(T)>1.5 GeV/c. The result constitutes the first observation of direct photons in ultrarelativistic heavy-ion collisions. It could be significant for diagnosis of quark-gluon-plasma formation.
Source:	PubMed, pmid11030959
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