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UrQMD vs RQMD and FLINT data

UrQMD vs RQMD and FLINT data. Sergey Kiselev , ITEP Introduction Input info Multiplicity of participants γ spectra γ spectra in the set-up θ spectra in the set-up slope parameter p 0 Summary. Introduction. RQMD4.12 generator 2 10 7 C+Be min.bias events at T/A=3.2 GeV

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UrQMD vs RQMD and FLINT data

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  1. UrQMD vs RQMD and FLINT data Sergey Kiselev, ITEP Introduction Input info Multiplicity of participants γ spectra γ spectra in the set-up θ spectra in the set-up slope parameter p0 Summary ITEP S.Kiselev

  2. Introduction RQMD4.12 generator 2 107 C+Be min.bias events at T/A=3.2 GeV - set-up θ = 550 - 730 - γ spectrum has a kink at pt = 1.1 GeV/c - γ spectrum drops sharply at pt = 1.6 GeV/c  other generator is needed,  UrQMD ? ITEP S.Kiselev

  3. Input info • C+Be min.bias (b<4.8 fm) at T/A=3.2 GeV • UrQMD1.3 generator: 107events • RQMD4.12 generator: 2 107 events • FLINT data, set-up θ = 550 - 730 ITEP S.Kiselev

  4. Multiplicity of participants, 106 ev. Part of events with participants: UrQMD – 86% RQMD – 83% Baryon charge of participants: UrQMD – 9.8 RQMD – 8.6 ~ 5 particles per event ~ 40 particles per event UrQMD: larger mean and RMS, but the same per participant ITEP S.Kiselev

  5. Multiplicity of species , 106 ev. GEANT codes 1. γ 16. KS 2. e+ 17. η 3. e- 18. Λ 4. ν 19. Σ+ 5. µ+ 20. Σ0 6. µ- 21. Σ- 7. π 22. Ξ0 8. π + 23. Ξ- 9. π - 24. Ω- 10. KL 25. n 11. K+ 26. Λ 12. K- 27. Σ+ 13. n 28. Σ0 14. p+ 29. Σ- 15. p- 30. Ξ0 34. ϕ - - - - - - ITEP S.Kiselev

  6. Spectra of γ, 107 events UrQMD: smaller <θ>, larger <p> ITEP S.Kiselev

  7. p spectra of γ in the set-up,107 ev. UrQMD: no a kink at p = 1.1 GeV/c 4 times larger γ at 1.2 GeV/c ITEP S.Kiselev

  8. θ spectra of γ in the set-up ITEP S.Kiselev

  9. slope parameter p0 for fit by exp(-p/ p0) p0 (data) > p0 (UrQMD) ITEP S.Kiselev

  10. Summary • UrQMD1.3 vs RQMD and FLINT data • UrQMD: no a kink at p = 1.1 GeV/c ~ 4 times larger γ at 1.2 GeV/c • p0 (data) > p0 (UrQMD) ITEP S.Kiselev

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