Interferometry of direct photons in Pb+Pb collisions at 158 AGeV
D. Peressounko, for WA98 collaboration
Abstract
We present final results from the WA98 experiment which provide first measurements of Bose-Einstein correlations of direct photons in ultrarelativistic heavy ion collisions. Invariant interferometric radii were extracted in the range 100<KT<300 MeV/c and compared to interferometric radii of charged pions. The yield of direct photons for 100<pT<300 MeV/c was extracted from the correlation strength parameter and compared to the yield of direct photons measured in WA98 at higher pT with the statistical subtraction method, and to predictions of a fireball model.
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