Abstract
Two-photon intensity interferometry is shown to provide an accurate measurement of the lifetime of the quark-gluon plasma created in ultra-relativistic heavy ion collisions via the difference of outward and sideward correlation radii. Under the assumption of a longitudinal, boost invariant expansion of the plasma, we obtain analytical expressions for the correlations from the quark-gluon plasma phase. A 3 + 1 dimensional expansion of the plasma along with a first order phase transition to hadrons is next considered, and leads to a source with two characteristic lifetimes, one of the quark-gluon plasma phase, and the other for the longer lived mixed phase. This may even help us to experimentally determine the order of the phase transition.
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