1. Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov & A.SeryakovLUHEP SPbSU St. Petersburg State University Laboratory of Ultra-High Energy Physics

2. 2 Terminology A.Capella et al., Phys.Rep. 236,225(1994) E.Andronov & A.SeryakovLUHEP SPbSU

3. 3 Terminology E.Andronov & A.SeryakovLUHEP SPbSU

4. 4 Terminology E.Andronov & A.SeryakovLUHEP SPbSU

5. 5 Analysis technique: MC Data Event cuts: 1.T2 2.WFA 1.5 μs 3.ZCharge (by Emil) 4.BPD 5.Fitted Vertex 6.Fit Quality 7.Number of good vertex tracks > 2 8.Z coordinate +/- 5cm 9.Centrality 0-20% Track cuts: 1.Vertex track status and has track 2.Impact parameter X < 4cm Y < 2cm 3.VTPC clusters > 14 or GapTPC > 4 4.All TPC clusters > 14 5.Pt < 1.5 GeV/c 6.Acceptance map MC Data (EPOS 1.99 by Emil) SimEvents 1.Centrality 0-20%1.Pt < 1.5 GeV/c 2.Acceptance map RecEvents 1.Number of good vertex tracks > 2 2.Z coordinate +/- 5cm 3.Centrality 0-20% 1.Vertex track status and has track 2.Impact parameter X < 4cm Y < 2cm 3.VTPC clusters > 14 or GapTPC > 4 4.All TPC clusters > 14 5.Pt < 1.5 GeV/c 6.Acceptance map E.Andronov & A.SeryakovLUHEP SPbSU

6. 6 Analysis technique: MC correction E.Andronov & A.SeryakovLUHEP SPbSU 10d THSparse: multiplicity Forward+Forward- Backward+Backward-  Pt Forward+Forward- Backward+Backward- NetChargeForward Backward Bin_raw_corrected = Bin_raw*Bin_sim/Bin_rec if Bin_sim or Bin_rec doesn’t exist Bin_raw_corrected = Bin_raw

7. 7 Analysis technique: MC correction E.Andronov & A.SeryakovLUHEP SPbSU 10d THSparse: multiplicity Forward+Forward- Backward+Backward-  PtForward+Forward- Backward+Backward- NetChargeForward Backward Bin_raw_corrected = Bin_raw*Bin_sim/Bin_rec if Bin_sim or Bin_rec doesn’t exist Bin_raw_corrected = Bin_raw short range long range

8. 8 Short range correlation E.Andronov & A.SeryakovLUHEP SPbSU

9. 9 Short range correlation: multiplicity E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

10. 10 Short range correlation: Pt-multiplicity E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

11. 11 Short range correlation: Pt E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

12. 12 Long range correlation E.Andronov & A.SeryakovLUHEP SPbSU

13. 13 Long range correlation: multiplicity E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

14. 14 Long range correlation: Pt-multiplicity E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

15. 15 Long range correlation: Pt E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data

16. 16 Long range correlation: Pt E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data Long range

17. 17 Conclusions, results and plans … E.Andronov & A.SeryakovLUHEP SPbSU Pt-N Real data EPOS Pt-Pt Pt-N

18. 18 Backup E.Andronov & A.SeryakovLUHEP SPbSU

19. 19 Net charge correlation E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% EPOS Reconstructed data Simulated data Simulated without accept. Real data Raw data Corrected data Long range Short range

20. 20 Long range correlation: Pt E.Andronov & A.SeryakovLUHEP SPbSU Centrality 0-20% all charges negative positive negative from forward | positive from backward positive from forward | negative from backward