ar X iv : h ep - p h / 98 05 22 0 v 1 4 M ay 1 99 8 LA - UR - 98 - 1843 Hadron Mass Scaling in Regge Phenomenology ∗

We show that Regge phenomenology is consistent with the only universal scaling law for hadron masses, M * /M = (α ′ /α ′ *) 1/2 , where asterisk indicates a finite-temperature quantity. Phenomenological models further suggest the following expression of the above scaling in terms of the temperature-dependent gluon conden-sate: M * /M = (α ′ /α ′ *) 1/2 = (G a µν * /G aµν) 1/4. It is known that the properties of hadrons undergo modifications at finite temperature or in nuclear medium [1]. Recently considerable amount of work has been devoted to the question of the reduction of the vector meson masses at finite temperature and/or density from both theoretical and experimental viewpoints. It has been suggested that the quenching of the longitudinal response in the quasi-elastic electron-nucleus scattering [2] and the enhancement of the K + N scattering cross-section [3] can be understood as possible consequences of the reduction of the vector meson mass in nuclear medium.