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Using two specific models and a model-independent formalism, we show that inaddition to the usual quadratic ``side'', ``out'' and ``longitudinal'' terms, apreviously neglected ``out-longitudinal'' cross term arises naturally in theexponent of the two-particle correlator. Since its effects can be easilyobserved, such a term should be included in any experimental fits tocorrelation data. We also suggest a method of organizing correlation data usingrapidity rather than longitudinal momentum differences since in the formerevery relevant quantity is longitudinally boost invariant.Comment: 11 pages, RevTeX 3.0 and 2 postscript figure

New Cross Term in the Two-Particle Hanbury-Brown–Twiss Correlation Function in Ultrarelativistic Heavy-Ion Collisions