Direct photon interferometry

Abstract

We consider recent developments in the theory of the two-photon interferometry in ultrarelativistic heavy ion collisions with emphasis on the difference between photon and hadron interferometry. We review the available experimental results and discuss possibilities of measurement of the photon Bose-Einstein correlations in ongoing and future experiments.

Comments: 6 pages, prepared for the Proceedings of Workshop on Particle Correlations and Femtoscopy (WPCF), Kromeriz, Czech Republic, August 15-17, 2005. Ref. added