Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
Preprint
- 13 June 2000
Abstract
A measurement of direct photon production in 208Pb + 208Pb collisions at 158 A 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 results constitute the first observation of direct photons in ultrarelativistic heavy-ion collisions which could be significant for diagnosis of quark gluon plasma formation.Keywords
All Related Versions
- Version 1, 2000-06-13, ArXiv
- Published version: Physical Review Letters, 85 (17), 3595.
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