Phys. Rev. Lett. 85, 3595 - 3599 (2000)

Observation of Direct Photons in Central 158A GeV 208P208b+Pb Collisions

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M. M. Aggarwal et al. (WA98 Collaboration)
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Featured in Physics News Update Received 13 June 2000

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<4 GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at pT>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.


©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v85/p3595
DOI: 10.1103/PhysRevLett.85.3595
PACS: 25.75.-q, 12.38.Mh, 24.85.+p

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