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Event-by-event fluctuations of particle ratios in central Pb+Pb collisions at 20-158 a GeV
Recent results of the NA49 energy scan programme show a sharp maximum of the ratio of $K^{+}$ to $\pi^{+}$ yields in central Pb+Pb collisions at beam energies of 20-30 A GeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present results on event...
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| Lenguaje: | eng |
| Publicado: |
2005
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| Acceso en línea: | https://dx.doi.org/10.1088/0954-3899/31/6/061 http://cds.cern.ch/record/913849 |
| Sumario: | Recent results of the NA49 energy scan programme show a sharp maximum of the ratio of $K^{+}$ to $\pi^{+}$ yields in central Pb+Pb collisions at beam energies of 20-30 A GeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present results on event-by-event fluctuations of the kaon to pion and proton to pion ratios at beam energies close to this maximum. A significant increase of the fluctuation signal of the kaon to pion ratio with deceasing beam energy is observed. (12 refs). |
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