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Baryon Stopping at 40 and 158 A GeV

Baryon Stopping at 40 and 158 A GeV. Net proton spectra in pp, peripheral and central PbPb collisions. outline. energy loss and baryon transport (normalized) rapidity and Feynman x net protons, net baryons, baryochemical potential (Anti-L/Anti-p)

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Baryon Stopping at 40 and 158 A GeV

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  1. Baryon Stopping at 40 and 158 A GeV Net proton spectra in pp, peripheral and central PbPb collisions H. Ströbele Goethe-Universität Frankfurt

  2. outline • energy loss and baryon transport • (normalized) rapidity and Feynman x • net protons, net baryons, baryochemical potential (Anti-L/Anti-p) • rapidity loss: scaling in “fragmentation” and mid-rapidity regions ?? • sqrt(s) dependence of rapidity shape and ~ loss, • sqrt(s) dependence of chem.-temperature and <p_T> • centrality dependence of rapidity shape and ~ loss at 40 & 158 GeV/nucleon • centrality dependence of chem.-temperature(?) and <p_T> at 40 & 158 GeV/nucleon • model comparison: HSD, UrQMD, core corona H. Ströbele Goethe-Universität Frankfurt

  3. energy loss and baryon transport • In particle collisions part of the cm-energy of the incident particles is diverted into: • Thermal motion • Radial or transverse flow • Mass (particle production) • The remaining energy stays in the longitudinal motion • => plong∙c = (√s – Ethermal – Eflow – ∑mi∙c2)/2 H. Ströbele Goethe-Universität Frankfurt

  4. energy loss and baryon transport • => plong∙c = (√s – Ethermal + Eflow + ∑mi∙c2)/2 • Plongis commonly represented by • rapidity: y = ln((E+plong)/mT) (energy loss causes rapidity shift (e.g. ΔEcm=0.5 ≈> Δy=0.7)). • or • Feynman x: xF = plong/pbeam (energy loss is mapped directly on xF (e.g. ΔE=0.5 ≈> xF= 1 – 0.5)). H. Ströbele Goethe-Universität Frankfurt

  5. We will compare proton rapidity distributions from 40 and 158 A GeV PbPb collisions at different centralities to nucleon-nucleon (NN) data (as a base line). • First get the base line, i.e. NN H. Ströbele Goethe-Universität Frankfurt

  6. energy loss and baryon transportexample: p+p =>p + X at 158 GeVnew from NA49[arXiv:0904.2708v1 [hep-ex] • rapidity XF distribution H. Ströbele Goethe-Universität Frankfurt

  7. energy loss and baryon transportexample: p+p =>p + X at 158 GeV • Neutron complication • dn/dx of net neutrons must be converted into dn/dy H. Ströbele Goethe-Universität Frankfurt

  8. energy loss and baryon transportexample: p+p =>p + X at 158 GeV • hyperon complication H. Ströbele Goethe-Universität Frankfurt

  9. energy loss and baryon transportexample: p+p =>p + X at 158 GeV • Base line for centrality dependend Pb+Pb collisions at 158 A GeV: • pp => p + X • pp => n + X • pp => Y+ X • What about 40 A GeV (no data on elementary collisions ) H. Ströbele Goethe-Universität Frankfurt

  10. energy loss and baryon transportexample: p+p =>p + X at 12 & 24 GeV (Blobel data) H. Ströbele Goethe-Universität Frankfurt

  11. energy loss and baryon transportexample: p+p =>p + X at 40 GeV/c H. Ströbele Goethe-Universität Frankfurt

  12. energy loss and baryon transportparametrization H. Ströbele Goethe-Universität Frankfurt

  13. energy loss and baryon transportparametrization H. Ströbele Goethe-Universität Frankfurt

  14. energy loss and baryon transportrapidity shift in nuclear collisions H. Ströbele Goethe-Universität Frankfurt

  15. Results on Pb+Pb at SPS 158 A GeV H. Ströbele Goethe-Universität Frankfurt

  16. Results on Pb+Pb at SPS 158 A GeV net protons H. Ströbele Goethe-Universität Frankfurt

  17. Results on Pb+Pb at SPS 158 A GeV Normalized to Nw H. Ströbele Goethe-Universität Frankfurt

  18. Results on Pb+Pb at SPS 158 A GeV net protons peripheral versus pp. normalisation? H. Ströbele Goethe-Universität Frankfurt

  19. Results on Pb+Pb at SPS 40 A GeV H. Ströbele Goethe-Universität Frankfurt

  20. Results on Pb+Pb at SPS 40 A GeV peripheral versus pp H. Ströbele Goethe-Universität Frankfurt

  21. Results on Pb+Pb at SPS 40 A GeV extrapolation to y_beam?? H. Ströbele Goethe-Universität Frankfurt

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