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Phys Rev Lett
; 85(17): 3595-9, 2000 Oct 23.
Article
in English
| MEDLINE
| ID: mdl-11030959
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
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.
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