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Predictions for Hadronic Yields at 5.52 TeV Pb+Pb

Predictions for Hadronic Yields at 5.52 TeV Pb+Pb. B. Lukács and A. Ster + many, back to 1987 as. History. J. Zimányi and A. Rácz H-W. Barz T. S. Biró L. P. Csernai T. Csörg ő B. Jakobsson B. Kämpfer Gy. Kuti P. Lévai K. Martinás L. Polonyi K. Szlachányi Gy. Wolf.

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Predictions for Hadronic Yields at 5.52 TeV Pb+Pb

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  1. Predictions for Hadronic Yields at 5.52 TeV Pb+Pb B. Lukács and A. Ster + many, back to 1987 as

  2. History • J. Zimányi and A. Rácz • H-W. Barz • T. S. Biró • L. P. Csernai • T. Csörgő • B. Jakobsson • B. Kämpfer • Gy. Kuti • P. Lévai • K. Martinás • L. Polonyi • K. Szlachányi • Gy. Wolf

  3. Rehadronisation Models • #1-#8: (Gluon Fragmentation; Final Hadronic Masses; Final State Compressibility) 0: No, 1: Yes with Weight 1 as Binary +1 • #9: No Quark Phase At All • #10: Sequential Fission • #11: As #7 but with Maximal Possible Gluon Fragmentation (weight 1.36)

  4. E/N vs. S/N, Pb+Pb

  5. Figure is direct calculation. For the upper 4 points a logarithmic fit is excellent, expected as ultrarelativistic: S/N=47.019+2.168*ln(Ecm/A, GeV)±0.14. See Table.

  6. Rehadronisation, Xi/N

  7. Rehadronisation, Xi/N, low S/N

  8. Successes/failures at SPS/RHIC

  9. Notes • These are χ² mean deviations for measured ratios. It seems that until SPS energies #9 is the best; for RHIC #7 is the best, #5 is close second, but simple averaging does not help.

  10. Checks for SPS/RHIC energies; ratios used

  11. Model predictions, u & d are not yet distinguished

  12. Model deviations from conservations + efficiency of transferring the kinetic energy #7 is quite good for conservation; efficiency is 0.5 %.

  13. Quark charges/spins considered • Total starting quarks: u=578, d=664, s=0, • Antiquarks 0. Final state masses & gluon fragmentation are u/d symmetric. Models: random u/d selection from common pool.

  14. Taking charge into consideration; results

  15. Various mispredictions and a 2.76 TeV/A preliminary

  16. For RHIC energies pions are overabundant; probable reason hadronosation into resonances. It seems that it was cca. 50 % for 200 GeV. For 2.76 TeV Ω yield is geometric mean of #7 & #5. Otherwise… PROBLEMS

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