PRECURSORY WEAKENING OF STRING TENSION AND SCENARIO OF CHARMONIUM SUPPRESSION

Effects of survival and transition probabilities of charmoniums to scenario of charmonium suppression in nucleus-nucleus collision are discussed in a framework of 1-dimensional hydrodynamical model of fire-ball expansion. In case of precursory weakening of string tension toward the critical temperature, long persistency of survival and transition probabilities leads to incomplete melting of charmoniums even when initial energy density goes deeply into the deconfining phase. Significance of hadronic interactions in mixed phase era is also shown. Absorptive channels, dissociation into DDBAR and OZI breaking decay of n(c), are efficient in that period. A signal of charmonium melting by deconfinement transition will be that initial energy density dependence of suppression of phi' becomes milder in comparison with J/phi.