2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39434Event-by-Event fluctuations for high energy heavy-ion collisions are investigated. The $Φ$-measures are calculated for pions. It is found that multiparticle symmetrization correlation has great influence on the value of $Φ$ if the phase space density is high. Previous derivation of $Φ$-measure has neglected multiparticle quantum correlation. So the explanation of $Φ$-measure as a measure of dynamical correlation is reasonable only when multiparticles quantum correlation effects are smaller. We argue that the $Φ$-measure might be applicable at the SPS energy where the pion phase space density is much less than one.final version to be published in Int. J. of Mod. Phys AHigh Energy Physics - PhenomenologyNuclear ExperimentNuclear Theorytext