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Energy dependence of p and p production in central Pb+Pb collisions from NA49

Energy dependence of p and p production in central Pb+Pb collisions from NA49. Ewelina Kornaś IFJ PAN Krakow, Poland for the collaboration Hot Quarks 2006. Stopping Energy dependence of p - p. AGS →SPS → RHIC : Stopping → Transparency Phys.Rev.Lett.93,102301(2004)

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Energy dependence of p and p production in central Pb+Pb collisions from NA49

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  1. Energy dependence of p and p production in central Pb+Pb collisions from NA49 Ewelina Kornaś IFJ PAN Krakow, Poland for the collaboration Hot Quarks 2006

  2. StoppingEnergy dependence of p - p AGS →SPS → RHIC : Stopping → Transparency Phys.Rev.Lett.93,102301(2004) The shape of the distributions changes with energy

  3. 158 AGeV data from NA49 Rather large but not complete stopping The rapidity loss δy~1.75+-0.05 for Pb+Pb Central Pb+Pb 158 AGeV Phys.Rev.Lett.82,2471(99)

  4. The NA49 experiment • large acceptance hadron spectrometer • tracking (TPCs) • particle identification by dE/dx (3-6% res.) and TOF (60 ps res.) around midrapidity • centrality determination: Veto calorimeter

  5. Mid-rapidity p, p mt-spectra in central Pb+Pb from NA49 Phys.Rev.C73,044910(2006)the shape of mT spectra hardly changes the shape can be described by in the SPS energy regionhydro-inspired models (temperature plus collective radial flow)

  6. Mid-rapidity central Pb+Pb @ 20-158 AGeV Phys.Rev.C73,044910(2006) The increase of the p/p ratio reflects the decrease of the baryochemical potential towards higher energy

  7. Analysis of the MTPC data • Advantage – larger acceptance • Particle identification – dE/dx MTPC has been optimized for the best dE/dx resolution dE/dx p=14 GeV pt=0.3GeV

  8. Geometrical acceptance of the MTPC for protons • 40 AGeV central Pb+Pb data |φ| <300

  9. corrected for geometrical acceptance reconstruction efficiency not yet corrected for feeddown 40 AGeV central Pb+Pb data from NA49the preliminary results are

  10. dN/dy distribution for 40AGeV data ■ data PRELIMINARY □reflected

  11. dN/dy distribution for 40 AGeV data ■ data PRELIMINARY □ reflected ▲TOF analysis (corrected for feeddown)

  12. Summary • NA49 published p and p yields at midrapidity for the SPS energy range • Preliminary results have been shown for the rapidity distributions of p and p at 40AGeV Outlook • 4π yields of p and p at all SPS energies • Results provide interesting information in the energy range where transparency develops in nuclear collisions

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