Observation of Direct Photons in Central 158A GeV P208b+P208b Collisions

M. M. Aggarwal et al. (WA98 Collaboration)
Phys. Rev. Lett. 85, 3595 – Published 23 October 2000
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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<pT<4GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at pT>1.5GeV/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.

  • Received 13 June 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.3595

©2000 American Physical Society

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Vol. 85, Iss. 17 — 23 October 2000

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