2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150937We discuss the possibility to observe hadron modification in hot and dense matter via the correlation of identical particles. We find that a modification of hadronic masses in medium leads to two-mode squeezing which signals itself in a back-to-back correlations of hadrons. This effect leads to a signal of a shift of $ϕ$-meson mass.LaTeX, 5 pages, 1 figure, uses sprocl.sty . Substantially revised version, eq. (9) and Fig. 1 corrected. Talk given by T. Csorgo at the Strong and Electroweak Matter'97 Conference, Eger, Hungary, May 21-25, 1997. (World Scientific, Singapore, ed. F. Csikor et al, to appear)Quantum PhysicsHigh Energy Physics - PhenomenologyNuclear Theorytext