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We report the preliminary results of momentum distributions of ϕ-meson, measured by the STAR Experiment at RHIC, from 200 GeV and 62.4 GeV collisions. We find (i) the number of participant normalized ratios of the yields from heavy-ion collisions over that of collisions, r SE (ϕ) > 1 in both and collisions at RHIC; (ii) the ratio is proportional to the colliding energy, i.e. r 200 SE (ϕ) > r 62.4 SE (ϕ). These results reveal that ϕ-meson production in nucleus–nucleus production is not a consequence of a simple lifting of canonical suppression from to AA collisions.
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Nu Xu (2008) studied this question.
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