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28.09.2007ECAL PID1 Particle identification in ECAL Yuri Kharlov, Alexander Artamonov IHEP, Protvino CBM collaboration meeting 28.09.2007.

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Presentation on theme: "28.09.2007ECAL PID1 Particle identification in ECAL Yuri Kharlov, Alexander Artamonov IHEP, Protvino CBM collaboration meeting 28.09.2007."— Presentation transcript:

1 28.09.2007ECAL PID1 Particle identification in ECAL Yuri Kharlov, Alexander Artamonov IHEP, Protvino CBM collaboration meeting 28.09.2007

2 ECAL PID2 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

3 28.09.2007ECAL PID3 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 ns is sufficient for rejection of K 0 and neutrons

4 28.09.2007ECAL PID4 Longitudinal profile of electromagnetic shower (PDG)

5 28.09.2007ECAL PID5 Prototype of “Two-Sections” ECAL Module Two channel PMT based on PM FEU- 115M dynode system 110 450 20X 0 = 10X 0 + 10X 0 Total radiation length = 20 X o. 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 Lucite prism for uniform light mixing 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

6 28.09.2007ECAL PID6 2-segment module design Separate light collection to 2-channel PMT V.Brekhovskikh, V.Rykalin 21 September 2006

7 28.09.2007ECAL PID7 All calorimeter Preshower Accepted electrons (84%) Rejected pions (93%) Beam measurements of 2-segment module V.Brekhovskikh, V.Rykalin 21 September 2006

8 28.09.2007ECAL PID8 Simulation model 1 module with 160 layers (Pb 0.7 mm + Sci 1.0 mm) Total radiation length: 20X 0. 20 longitudinal segments, each of 8 layers Various combinations of energies deposited in different segments allow to optimize longitudinal segmentation

9 28.09.2007ECAL PID9 E det vs Segment number: 5 GeV PhotonsHadrons

10 28.09.2007ECAL PID10 E det vs Segment number : 10 GeV PhotonsHadrons

11 28.09.2007ECAL PID11 E det vs Segment number : 15 GeV PhotonsHadrons

12 28.09.2007ECAL PID12 Longitudinal profile: Photons 5 GeV10 GeV

13 28.09.2007ECAL PID13 Longitudinal profile: Hadrons 5 GeV10 GeV

14 28.09.2007ECAL PID14 Longitudinal profile: Muons 5 GeV10 GeV

15 28.09.2007ECAL PID15 E1/E2, 5 GeV (1X 0 +19X 0 )

16 28.09.2007ECAL PID16 E1/E2, 5 GeV (2X 0 +18X 0 )

17 28.09.2007ECAL PID17 E1/E2, 5 GeV (3X 0 +17X 0 )

18 28.09.2007ECAL PID18 E1/E2, 5 GeV (4X 0 +16X 0 )

19 28.09.2007ECAL PID19 Identification probabilities (1X 0 +19X 0 ) E 1 /E2 cut 0.0050.0100.0150.0200.0250.030 5 GeV  0.725 0.8720.9380.9620.9690.972 -- 0.200 0.3310.3810.4050.4240.447 10 GeV  0.857 0.9570.9680.970 -- 0.250 0.3570.4050.4390.4620.482 15 GeV  0.925 0.9700.972 -- 0.281 0.3810.4250.4510.4740.498 S/B=3.5

20 28.09.2007ECAL PID20 Identification probabilities (2X 0 +18X 0 ) E 1 /E2 cut 0.0100.0300.0350.0450.0550.065 5 GeV  0.418 0.5630.7340.8210.8820.920 -- 0.132 0.2870.3660.3890.4060.426 10 GeV  0.525 0.7160.8860.9400.9600.967 -- 0.196 0.3180.3940.4210.4420.463 15 GeV  0.608 0.8180.9480.9660.9700.972 -- 0.229 0.3460.4140.4360.4550.476 S/B=3

21 28.09.2007ECAL PID21 Identification probabilities (3X 0 +17X 0 ) E 1 /E2 cut 0.050.100.150.200.25 5 GeV  0.432 0.689 0.8650.9380.965 -- 0.330 0.395 0.5500.7740.840 10 GeV  0.582 0.867 0.9550.9690.970 -- 0.359 0.436 0.5960.8350.907 15 GeV  0.692 0.939 0.9700.972 -- 0.381 0.445 0.6120.8570.924 S/B=2

22 28.09.2007ECAL PID22 Identification probabilities (4X 0 +16X 0 ) E 1 /E2 cut 0.100.200.300.400.50 5 GeV  0.334 0.613 0.8240.9250.960 -- 0.341 0.462 0.7750.8350.853 10 GeV  0.466 0.810 0.9430.9670.970 -- 0.380 0.517 0.8490.9160.935 15 GeV  0.576 0.906 0.9670.972 -- 0.394 0.530 0.8660.9330.952 S/B=1.5

23 28.09.2007ECAL PID23 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

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