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Particle identification in ECAL

Particle identification in ECAL. Yuri Kharlov, Alexander Artamonov IHEP, Protvino CBM collaboration meeting 28.09.2007. PID methods applicable for ECAL. The aim of ECAL PID is to discriminate  and e  from anything else Charged track matching

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Particle identification in ECAL

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  1. Particle identification in ECAL Yuri Kharlov, Alexander Artamonov IHEP, Protvino CBM collaboration meeting 28.09.2007 ECAL PID

  2. PID methods applicable for ECAL The aim of ECAL PID is to discriminate  and e from anything else • Charged track matching • Reject (for ) or identify (for e) ECAL clusters produced by charged tracks • Flight time measurement • Reject ECAL clusters produced by slow particles (mainly heavy hadrons) • Transverse shower shape • Discriminate electromagnetic and hadronic showers • Longitudinal shower profile • Discriminate electromagnetic and hadronic showers ECAL PID

  3. Flight time from target to ECAL (12 m) Neutral hadrons contribute to photon spectrum mainly at E<2 GeV Significant background is expected from antineutrons at 1.8 GeV Time resolution t=1 nsis sufficient for rejection of K0 and neutrons ECAL PID

  4. Longitudinal profile of electromagnetic shower (PDG) ECAL PID

  5. Prototype of “Two-Sections” ECAL Module 20X0 = 10X0 + 10X0 Two channel PMT based on PM FEU-115M dynode system 110 Lucite prism for uniform light mixing 450 Total radiation length = 20Xo. Number of layers = 85 Lead plate thickness = 1.3 mm Scintillator plate thickness = 4.0 mm Scintillator –Polystyrene + 1.5%PT + 0.05% POPOP Wave Length Shifting Fibers – Y11 Light from the first half of calorimeter (preshower) was collected to one anode and light from the second half to another. V.Brekhovskikh, V.Rykalin 21 September 2006 ECAL PID

  6. 2-segment module design Separate light collection to 2-channel PMT V.Brekhovskikh, V.Rykalin 21 September 2006 ECAL PID

  7. Beam measurements of 2-segment module All calorimeter Preshower Accepted electrons (84%) Rejected pions (93%) V.Brekhovskikh, V.Rykalin 21 September 2006 ECAL PID

  8. Simulation model • 1 module with 160 layers (Pb 0.7 mm + Sci 1.0 mm) • Total radiation length: 20X0. • 20 longitudinal segments, each of 8 layers • Various combinations of energies deposited in different segments allow to optimize longitudinal segmentation ECAL PID

  9. Edet vs Segment number: 5 GeV Photons Hadrons ECAL PID

  10. Edet vs Segment number : 10 GeV Photons Hadrons ECAL PID

  11. Edet vs Segment number : 15 GeV Photons Hadrons ECAL PID

  12. Longitudinal profile: Photons 5 GeV 10 GeV ECAL PID

  13. Longitudinal profile: Hadrons 5 GeV 10 GeV ECAL PID

  14. Longitudinal profile: Muons 5 GeV 10 GeV ECAL PID

  15. E1/E2, 5 GeV (1X0+19X0) ECAL PID

  16. E1/E2, 5 GeV (2X0+18X0) ECAL PID

  17. E1/E2, 5 GeV (3X0+17X0) ECAL PID

  18. E1/E2, 5 GeV (4X0+16X0) ECAL PID

  19. Identification probabilities (1X0+19X0) S/B=3.5 ECAL PID

  20. Identification probabilities (2X0+18X0) S/B=3 ECAL PID

  21. Identification probabilities (3X0+17X0) S/B=2 ECAL PID

  22. Identification probabilities (4X0+16X0) S/B=1.5 ECAL PID

  23. To do • 3-segment module: the optimal segmentation to be found • Realistic momentum distribution of incoming particles • Realistic particle multiplicity to be studied • Track-ECAL matching and optimization of the matching distance for charged particle rejection • Simulation of realistic TOF measurement in ECAL and optimization of ECAL-TOF cut for heavy hadron rejection • Photon identification efficiency and hadron contamination of the photon spectrum in central HI collisions ECAL PID

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