Centrality dependence of subthreshold φ meson production in Ni + Ni collisions at 1.9A GeV

FOPI Collaboration

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4 Citations (Scopus)


We analyzed the φ meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6±1.6(stat)±1.5(syst)]×10-4. This new data point allows us for the first time to inspect the centrality dependence of subthreshold φ meson production in heavy-ion collisions. The rise of φ meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent α=1.8±0.6. The ratio of φ to K- production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36±0.05.

Original languageEnglish
Article number014901
JournalPhysical Review C
Issue number1
Publication statusPublished - Jul 5 2016


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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