First observation of phi-meson directed flow v1 comparable in magnitude to protons and Lambdas but much larger than K0S, with baryon-like energy dependence at high baryon density.
Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV
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abstract
Phi 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 to 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.
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Observation of Strong $\phi$-meson Directed Flow at High Baryon Density
First observation of phi-meson directed flow v1 comparable in magnitude to protons and Lambdas but much larger than K0S, with baryon-like energy dependence at high baryon density.