Photon Interferometry of Quark-Gluon Dynamics Revisited
A. Timmermann, M. Pluemer, L. V. Razumov, R. M. Weiner
Abstract
The Bose-Einstein correlations of photons emitted from a longitudinally expanding system of excited matter produced in ultrarelativistic heavy ion collision are studied. Two effects found in recent calculations -- that the correlation function in longitudinal direction exhibits oscillations, and that it takes values below unity -- are demonstrated to be numerical artefacts and/or the results of inappropriate approximations. Thus, the general quantum statistical bounds for the two particle correlation function of a chaotic source with Gaussian fluctuations are confirmed. Two different expressions for the two-photon inclusive distribution are considered. Depending on which of the two expressions is used in the calculation, the width of the correlation function may vary by as much as 30\%. PACS numbers: 05.30.Jp, 13.85.Hd, 25.75.+r, 12.40.Ee
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