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1. Soft Hadron Production and Thresholds of Phase Changes in Relativistic Heavy Ion Collisions
by Jan Rafelski / Univ. Arizona/CERN
We consider the soft hadron production yields as function of reaction energy in relativistic heavy ion collisions. We find a threshold in energy which has the same properties as seen as function of volume size. This threshold appears to be delineating an entropy rich phase existing at high energy, and/or in large volume. Statistical hadronization method of data analysis of the latest experimental AGS, SPS and RHIC data will be presented, along with key results about properties of the fireball at the time of hadronization. In terms of the chemical composition this is a boundary between a phase which is under saturated, which turns rapidly into a chemically over saturated condition expected in hadronization of QGP.
2. Observation of the Onset of Deconfinement and Search for the Critical Point - Past and Future of the Ion Physics at the CERN SPS
by Marek Gazdzicki / IKF
Past: The results on the energy dependence of hadron production in central Pb+Pb collisions obtained within the energy scan program at the CERN SPS indicate that the onset of deconfinement is located at about 30A GeV. In particular, measured anomalies in the pion yield (the "kink"), the strangeness yield (the "horn") and the shape of transverse mass spectra (the "step") will be discussed. Future: The observation of the onset of deconfinement at about 30A GeV suggests that the critical point of strongly interacting matter, if it exists, may be discovered in ion collisions at higher energies. A possible future experimental program devoted to the search for the critical point at the CERN SPS will be discussed.
Organiser(s): Yiota Foka and Urs Achim Wiedemann
More information: http://home.cern.ch/a/alicedoc/www/chic/
by Jan Rafelski / Univ. Arizona/CERN
We consider the soft hadron production yields as function of reaction energy in relativistic heavy ion collisions. We find a threshold in energy which has the same properties as seen as function of volume size. This threshold appears to be delineating an entropy rich phase existing at high energy, and/or in large volume. Statistical hadronization method of data analysis of the latest experimental AGS, SPS and RHIC data will be presented, along with key results about properties of the fireball at the time of hadronization. In terms of the chemical composition this is a boundary between a phase which is under saturated, which turns rapidly into a chemically over saturated condition expected in hadronization of QGP.
2. Observation of the Onset of Deconfinement and Search for the Critical Point - Past and Future of the Ion Physics at the CERN SPS
by Marek Gazdzicki / IKF
Past: The results on the energy dependence of hadron production in central Pb+Pb collisions obtained within the energy scan program at the CERN SPS indicate that the onset of deconfinement is located at about 30A GeV. In particular, measured anomalies in the pion yield (the "kink"), the strangeness yield (the "horn") and the shape of transverse mass spectra (the "step") will be discussed. Future: The observation of the onset of deconfinement at about 30A GeV suggests that the critical point of strongly interacting matter, if it exists, may be discovered in ion collisions at higher energies. A possible future experimental program devoted to the search for the critical point at the CERN SPS will be discussed.
Organiser(s): Yiota Foka and Urs Achim Wiedemann
More information: http://home.cern.ch/a/alicedoc/www/chic/