Abstract
ϕ meson production is studied by the NA49 Collaboration in central Pb+Pb collisions at 20A,30A,40A,80A, and 158A GeV beam energy. The data are compared with measurements at lower and higher energies and with microscopic and thermal models. The energy dependence of yields and spectral distributions is compatible with the assumption that partonic degrees of freedom set in at low SPS energies.5 MoreReceived 10 June 2008DOI:https://doi.org/10.1103/PhysRevC.78.044907©2008 American Physical Society
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