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Transverse momentum vs. multiplicity correlations

Transverse momentum vs. multiplicity correlations. Agnieszka Wojtaszek-Szwarc Jan Kochanowski University. NA61/SHINE and NA49 meeting in Warsaw 10-14.02.2014. Analysis of p T - <N> correlation. Pb+Pb collision at 158, 80, 40, 30 and 20A GeV

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Transverse momentum vs. multiplicity correlations

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  1. Transverse momentum vs. multiplicity correlations AgnieszkaWojtaszek-Szwarc Jan Kochanowski University NA61/SHINE and NA49 meeting in Warsaw 10-14.02.2014

  2. Analysis of pT - <N> correlation • Pb+Pb collision at 158, 80, 40, 30 and 20A GeV • Only forward rapidity tracks 1.1<yCMS < 2.6, (rapidity is calculated assuming pion mass for all particles) with 0.005< pT <1.5 GeV/c have been used in this analysis. • Analysis havebeen done in narrow centrality bins A.Wojtaszek-Szwarc 14-02-2014

  3. Example of pT- N correlations Pb+Pb at 160A GeV Centrality 3.5% – 4.0% A.Wojtaszek-Szwarc 14-02-2014

  4. b parameter vs. centrality – all charged particles A.Wojtaszek-Szwarc 14-02-2014

  5. b parameter vs. centrality – negatively charged particles A.Wojtaszek-Szwarc 14-02-2014

  6. b parameter vs. centrality – positively charged particles A.Wojtaszek-Szwarc 14-02-2014

  7. VENUS data Pb + Pb 158A GeV 4 centrality bins – 25 k events in each bin A.Wojtaszek-Szwarc 14-02-2014

  8. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 1 fm< b <1.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = 3.21  1.0 VENUS + reconstruction + acceptance b = 3.81  1.1 A.Wojtaszek-Szwarc 14-02-2014

  9. VENUS – top panelsVENUS + acceptance – bottompanels A.Wojtaszek-Szwarc 14-02-2014

  10. VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottompanels A.Wojtaszek-Szwarc 14-02-2014

  11. Negatively charged particles, centrality 1.0-1.5 Venus Venus + reconstruction A.Wojtaszek-Szwarc 14-02-2014

  12. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 5 fm < b <5.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = 3.21  1.0 VENUS + reconstruction + acceptance b = 3.81  1.1 A.Wojtaszek-Szwarc 14-02-2014

  13. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 9 fm < b <9.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = 0.06  0.91 VENUS + reconstruction + acceptance b = 0.03  0.9 A.Wojtaszek-Szwarc 14-02-2014

  14. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 12 fm < b <12.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = -2.32  0.8 VENUS + reconstruction + acceptance b = -5.06  1.0 A.Wojtaszek-Szwarc 14-02-2014

  15. A.Wojtaszek-Szwarc 14-02-2014

  16. VENUS data Pb + Pb 80A GeV 2 centrality bins – 25 k events in each bin A.Wojtaszek-Szwarc 14-02-2014

  17. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 80A GeV. Collision parameter 1 < b <1.5 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = 3.54  1.14 VENUS + reconstruction + acceptance b = 1.59  0.81 A.Wojtaszek-Szwarc 14-02-2014

  18. Negatively charged particles, centrality 1.0-1.5 Venus Venus + reconstruction A.Wojtaszek-Szwarc 14-02-2014

  19. VENUS – top panelsVENUS + acceptance – bottompanels A.Wojtaszek-Szwarc 14-02-2014

  20. VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottompanels A.Wojtaszek-Szwarc 14-02-2014

  21. <pT> vs. N , negatively charged particles. MC data Pb+Pb at 80A GeV. Collision parameter 5 fm < b < 5.5 fm 0.005 < pT < 1.5 4.0 < y < 5.5 VENUS + acceptane b = 2.77  1.10 VENUS + reconstruction + acceptance b = 1.03  0.79 A.Wojtaszek-Szwarc 14-02-2014

  22. A.Wojtaszek-Szwarc 14-02-2014

  23. Correction of influence of detector acceptance on final results • For one collision energy we need 20 centrality bins. • 25 000 events in each bin. • Estimated time – 10 – 20 weeks for simulations of one collision energy (simulated data are stored on the tapes and reading them is time consuming process). • For preparation full statistic for all 5 collision energies we need 2 years. • Differences of value b for collision energy 158 and 80A GeV are smaller then statistical uncertainty of experimental data. • Good solution is to check the influence of detector acceptance for 3 different centrality bins for each collision energy. If the influence is too small we should publish data without any correction. A.Wojtaszek-Szwarc 14-02-2014

  24. Additional slides A.Wojtaszek-Szwarc 14-02-2014

  25. Additional slides A.Wojtaszek-Szwarc 14-02-2014

  26. Additional slides A.Wojtaszek-Szwarc 14-02-2014

  27. Additional slides A.Wojtaszek-Szwarc 14-02-2014

  28. Additional slides A.Wojtaszek-Szwarc 14-02-2014

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