2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186980Using two specific models and a model-independent formalism, we show that in addition to the usual quadratic ``side'', ``out'' and ``longitudinal'' terms, a previously neglected ``out-longitudinal'' cross term arises naturally in the exponent of the two-particle correlator. Since its effects can be easily observed, such a term should be included in any experimental fits to correlation data. We also suggest a method of organizing correlation data using rapidity rather than longitudinal momentum differences since in the former every relevant quantity is longitudinally boost invariant.11 pages, RevTeX 3.0 and 2 postscript figuresHigh Energy Physics - Phenomenologytext