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We present final results from the WA98 experiment which provide firstmeasurements of Bose-Einstein correlations of direct photons inultrarelativistic heavy ion collisions. Invariant interferometric radii wereextracted in the range $100<K_T<300$ MeV/c and compared to interferometricradii of charged pions. The yield of direct photons for $100<p_T<300$ MeV/c wasextracted from the correlation strength parameter and compared to the yield ofdirect photons measured in WA98 at higher $p_T$ with the statisticalsubtraction method, and to predictions of a fireball model.Comment: 4 pages, 3 figures, proceedings for Quark Matter 200

Interferometry of direct photons in208Pb+208Pb collisions at 158AGeV

Interferometry of direct photons in²⁰⁸Pb+²⁰⁸Pb collisions at 158AGeV