Particle identification in ecal
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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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Particle identification in ecal

Particle identification in ECAL

Yuri Kharlov, Alexander Artamonov

IHEP, Protvino

CBM collaboration meeting

28.09.2007

ECAL PID


Pid methods applicable for ecal

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


Flight time from target to ecal 12 m

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


Longitudinal profile of electromagnetic shower pdg

Longitudinal profile of electromagnetic shower (PDG)

ECAL PID


Particle identification in ecal

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


Particle identification in ecal

2-segment module design

Separate light collection to 2-channel PMT

V.Brekhovskikh, V.Rykalin 21 September 2006

ECAL PID


Particle identification in ecal

Beam measurements of 2-segment module

All calorimeter

Preshower

Accepted electrons (84%)

Rejected pions (93%)

V.Brekhovskikh, V.Rykalin 21 September 2006

ECAL PID


Simulation model

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


E det vs segment number 5 gev

Edet vs Segment number: 5 GeV

Photons

Hadrons

ECAL PID


E det vs segment number 10 gev

Edet vs Segment number : 10 GeV

Photons

Hadrons

ECAL PID


E det vs segment number 15 gev

Edet vs Segment number : 15 GeV

Photons

Hadrons

ECAL PID


Longitudinal profile photons

Longitudinal profile: Photons

5 GeV

10 GeV

ECAL PID


Longitudinal profile hadrons

Longitudinal profile: Hadrons

5 GeV

10 GeV

ECAL PID


Longitudinal profile muons

Longitudinal profile: Muons

5 GeV

10 GeV

ECAL PID


E1 e2 5 gev 1x 0 19x 0

E1/E2, 5 GeV (1X0+19X0)

ECAL PID


E1 e2 5 gev 2x 0 18x 0

E1/E2, 5 GeV (2X0+18X0)

ECAL PID


E1 e2 5 gev 3x 0 17x 0

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

ECAL PID


E1 e2 5 gev 4x 0 16x 0

E1/E2, 5 GeV (4X0+16X0)

ECAL PID


Identification probabilities 1x 0 19x 0

Identification probabilities (1X0+19X0)

S/B=3.5

ECAL PID


Identification probabilities 2x 0 18x 0

Identification probabilities (2X0+18X0)

S/B=3

ECAL PID


Identification probabilities 3x 0 17x 0

Identification probabilities (3X0+17X0)

S/B=2

ECAL PID


Identification probabilities 4x 0 16x 0

Identification probabilities (4X0+16X0)

S/B=1.5

ECAL PID


To do

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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