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Определение центральности столкновения ядер с использованием калориметра cпектаторов

Определение центральности столкновения ядер с использованием калориметра cпектаторов в эксперименте MPD@NICA. M.Golubeva , F.Guber , A.Ivashkin , A.Kurepin , INR, Moscow A.Litvinenko , E.Litvinenko , A.Isupov , I.Migulina , V.Peresedov , JINR, Dubna.

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Определение центральности столкновения ядер с использованием калориметра cпектаторов

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  1. Определение центральности столкновения ядер с использованием калориметра cпектаторов в эксперименте MPD@NICA M.Golubeva, F.Guber, A.Ivashkin, A.Kurepin, INR, Moscow A.Litvinenko, E.Litvinenko, A.Isupov, I.Migulina, V.Peresedov, JINR, Dubna A.Litvinenko,litvin@moonhe.jinr.ru A.Litvinenko VBLHEP JINR

  2. Outline • Introduction • Some definitions • Spectators • UrQMD generator • LAQGSM generator • UrQMD - SHIELD - LAQGSM • Conclusions A.Litvinenko VBLHEP JINR

  3. NICA A.Litvinenko VBLHEP JINR

  4. MPD A.Litvinenko VBLHEP JINR

  5. Nuclear-Nuclear collisions • Quasi-Classical picture • b – not observable • observablesb A.Litvinenko VBLHEP JINR

  6. Centrality classification Geometrical cross section • Value of impact parameter • In percent from the geometrical cross section Corresponds to the region impact parameter Centrality

  7. Centrality classification 1. Impact parameter 2.Fraction from total cross-section 3.Number of participant …. ?

  8. Centrality classification

  9. The importance of the centrality classification Elliptic flow Space eccentricity Nuclear Physics A V757, No. 1-2 , p.184,2005 elliptic flow scaling with space eccentricity short equlibration time A.Litvinenko VBLHEP JINR

  10. The importance of the centrality study Nuclear modification factor Nuclear Physics A V757, No. 1-2 , p.184,2005 Jet Quenching – nuclear modification factor vs centrality A.Litvinenko VBLHEP JINR

  11. The importance of the centrality study A.Litvinenko VBLHEP JINR

  12. A.Litvinenko VBLHEP JINR

  13. Nucleon spectators (spectrum) R.Ammarи et al., PismavJETF, V.94, No. 4, p.189, (1989) Yu.Bayukov et al., YaF V.35, No. 4, p.960, (1982) A.Litvinenko VBLHEP JINR

  14. Spectator spectrum A.Litvinenko VBLHEP JINR

  15. A.Litvinenko VBLHEP JINR

  16. Front view of ZDC. The squares size is 5 x 5 cm x cm A.Litvinenko VBLHEP JINR

  17. ZDC@MPD geometrical efficiency central hole out of ZDC A.Litvinenko VBLHEP JINR

  18. Simulation Transport – Geant3 and Geant4, generates UrQMD and LAQGSM framework MpdRoot A.Litvinenko VBLHEP JINR

  19. Optimistic results with UrQMD URQMD generator, Sqrt(S)=5 GeV Total kinetic energy of all nucleonsdirected to ZDC A.Litvinenko VBLHEP JINR

  20. Optimistic results with UrQMD UrQMD generator, Sqrt(S)=9 GeV Total kinetic energy of all nucleonsdirected to ZDC A.Litvinenko VBLHEP JINR

  21. The accuracy of impact parameter determination for MC with UrQMD A.Litvinenko VBLHEP JINR

  22. The centrality resolution evaluations √S=9 AGeV

  23. But The NA49 collaboration. Eur. Phys. J., A2, 383, (1998) A.Litvinenko VBLHEP JINR

  24. But LAQGSM high-energy event generator A.Litvinenko VBLHEP JINR

  25. Taking into account spectator fragments LAQGSM generator, Sqrt(S)=5 GeV Total kinetic energy of all nucleonsand fragments directed to ZDC A.Litvinenko VBLHEP JINR

  26. Taking into account spectator fragments LAQGSM generator, Sqrt(S)=9 GeV Total kinetic energy of all nucleonsand fragments directed to ZDC A.Litvinenko VBLHEP JINR

  27. SHIELD event generator A.Litvinenko VBLHEP JINR

  28. LAQGSM, Sqrt(S)=5 GeV URQMD, Sqrt(S)=5 GeV Total kinetic energy of all nucleonsand fragments directed to ZDC A.Litvinenko VBLHEP JINR

  29. A.Litvinenko VBLHEP JINR

  30. Experimental data : the deposited energy for different types of spectators in dependence of the centrality The NA49 collaboration. Eur. Phys. J., A2, 383, (1998) At large impact parameters the most of spectatornucleons are bound in fragments. A.Litvinenko VBLHEP JINR

  31. All nucleons directed to the hole of ZDC (rectangle 10x10cm2) 0 % - 60 % 60 % - 80 % 80 % - 100 % A.Litvinenko VBLHEP JINR

  32. Experimental data : the deposited energy for different types of spectators in dependence of the centrality The NA49 collaboration. Eur. Phys. J., A2, 383, (1998) At large impact parameters the most of spectatornucleons are bound in fragments. A.Litvinenko VBLHEP JINR

  33. The centrality resolution evaluations √S=9 AGeV Kinetic energy of all spectators directed to solid angle 5º 33

  34. The centrality resolution evaluations √S=9 AGeV

  35. The centrality resolution evaluations √S=9 AGeV

  36. The centrality resolution evaluations √S=9 AGeV

  37. The centrality determination: ZDC (energy) + number of charged barrel tracks A.Litvinenko VBLHEP JINR

  38. UrQMD - SHIELD - LAQGSM b < 3 фм (0 – 4 %) A.Litvinenko VBLHEP JINR

  39. UrQMD - SHIELD - LAQGSM 3 фм < b < 9.5 фм (4 – 40 %) A.Litvinenko VBLHEP JINR

  40. UrQMD - SHIELD - LAQGSM 9.5 фм < b (40 – 100 %) A.Litvinenko VBLHEP JINR

  41. Centrality determination in some experiment PHENIX NA49 STAR y=0 y=3 y>6 A.Litvinenko VBLHEP JINR

  42. Conclusions • The SHIELD and LAQGSM could be used for NICA/MPD simulations under mpdroot. • The SHIELD and LAQGSM angular distributions of the spectators differ from URQMD picture. • The experimental study of the spectator distributions and calorimeter resolution have to be performed on the extracted beam of NUCLOTRON-M at the fixed target. A.Litvinenko VBLHEP JINR

  43. Conclusions • Работа выполнена при поддержке грантов РФФИ 10-02-01036-а 11-02-01026-а A.Litvinenko VBLHEP JINR

  44. Backup slides A.Litvinenko VBLHEP JINR

  45. A.Litvinenko VBLHEP JINR

  46. Fast evaluations: the movement of spectators at NICA/MPD • The conclusion: • Magnetic field ofMPD will not change the polar angles • for spectators atZDCposition • it will only slightly changes the azimutal angles A.Litvinenko VBLHEP JINR

  47. A.Litvinenko VBLHEP JINR

  48. A.Litvinenko VBLHEP JINR

  49. A.Litvinenko VBLHEP JINR

  50. Centrality classification C.E.Aguilar et al., Brazilian Journal of Physics, V.34,No.1,p.319,(2004) A.Litvinenko VBLHEP JINR

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