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Muon simulations. Anna Kiseleva. Outline. Muon simulations for different collision systems: SIS 300 SIS 100 Muon system optimizations: material of pipe shielding thickness of first absorber alternative solutions of muon system Additional electrons from absorber:

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muon simulations

Muon simulations

Anna Kiseleva

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

outline
Outline
  • Muon simulations for different collision systems:
    • SIS 300
    • SIS 100
  • Muon system optimizations:
    • material of pipe shielding
    • thickness of first absorber
    • alternative solutions of muon system
  • Additional electrons from absorber:
    • comparison of different simulation tools
    • enhanced "noise" from secondary electrons
  • Conclusions
  • Next steps

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

simulations
Simulations
  • cbmroot release v.APR08
  • signals: multiplicities from HSD, Pluto generator
    • ω, J/ψ
  • background: UrQMD central events
    • Au+Au at 15, 25 and 35 AGeV
    • Au+Au at 8 AGeV
    • p+C at 30 GeV
  • muon magnet
  • standard STS
  • standard MuCh
  • MuCh hit producer without clusters
  • L1 (STS) and L1/Lit (MuCh) tracking

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

standard mu on ch ambers much system
Standard Muon Chambers (MuCh) system

5%

occupancy

for central

Au+Au collisions

at 25 AGeV

w/o shielding

Fe

20 20 20 30 35 100 cm

min pad

1.42.8 mm2

shielding

max pad

44.844.8 mm2

Total number

of channels:

480768

≡ 7.5 λI

≡ 13.5 λI

low-mass vector meson measurements

(compact setup)

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

au au at 25 agev

 background

signals

 ρ

ω

 φ

 η

ηDalitz

Au+Au at 25 AGeV*

Signal-to- Efficiency Mass

Background (%) resolution

(S/B) ratio (MeV)

ω 0.09 2 10

φ 0.03 4 12

J/ψ 18 13 21

Ψ' 0.8 16 27

 background

signals

 J/ψ

 Ψ'

* 10th CBM Collaboration Meeting

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

lit tracking
Lit tracking

Andrey Lebedev

"Track reconstruction in MUCH"

Events:

URQMD central Au+Au at 25 AGeV

+

5 mu+ and 5 mu- in each event

(p=1.5..10 GeV/c for compact and p=2.5..25 GeV/c for standard)

Compact MuCh:

5 Fe absorbers (125 cm)

10 detector stations

Standard MuCh:

6 Fe absorbers (225 cm)

18 detector stations

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

tracking procedures
Tracking procedures

Reconstructed background:

L1 Lit

Andrey Lebedev

"Track reconstruction in MUCH"

ω→μ+μ- + central Au+Au collisions

at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

sis 100

SIS 100

Au+Au at 8 AGeV

p+C at 30 GeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

compact muon system

Pluto

Au+Au at 8 AGeV

Compact muon system

ω in Au+Au

collisions at 8 AGeV

min. 9 hits tracks min. 12 hits tracks

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

results of l1 reconstruction

Au+Au at 8 AGeV

Results of L1 reconstruction

* we can improve results, if we will have ToF pID in MuCh and/or make some simple modifications of CBM setup (see backup slides)

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

results of l1 reconstruction1

p+C at 30 GeV

Results of L1 reconstruction

ω + central p+C collisions

J/ψ + central p+C collisions

1 ω→μ+μ- in 105 central events

4 J/ψ→μ+μ- in 109 central events

comparison of HSD and Pluto generated J/psi - see backup slides

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

muon system optimization

Muon system optimization

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

material of pipe shielding
Material of pipe shielding

1

2

3

central Au+Au collisions at 25 AGeV

particles/(event×cm2)

―Fe

―W

―Pb + Fe

4

5

particles/(event×cm2)

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

thickness of first absorber

Thickness of first absorber

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

motivation decrease hit density in first detector layers
Motivation: decrease hit density in first detector layers

with pipe

shielding

with pipe

shielding

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

particle absorption
Particle absorption

central Au+Au

collisions at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

thickness of first absorber fe
Thickness of first absorber (Fe)

central Au+Au collisions at 25 AGeV

10 cm Fe

20 cm Fe

30 cm Fe

40 cm Fe

10 cm  100 cm

ω→μ+μ- + central Au+Au collisions at 25 AGeV

ghosts !

4

≥4STS+3MuCh

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

alternative muon systems

40 20 20 20 25

30 20 20 20 35

20 20 20 30 35

10 20 30 30 35

Alternative muon systems

central Au+Au collisions at 25 AGeV

10 cm Fe

20 cm Fe

30 cm Fe

40 cm Fe

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

much 25 30 40 40
MuCh 25 30 40 40

25 30 40 40

Nchannels 439 296 → 272 384

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

comparison
Comparison

―MuCh 20 20 20 30 35

―MuCh 25 30 40 40

ω→μ+μ- + central Au+Au

collisions at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

additional electrons from absorber

Additional electrons from absorber

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

particle rate in first much detector
Particle rate in first MuCh detector

TGEANT3: hadronic process

TGEANT4: QGSP_BERT_EMV

TFluka

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

particle statistics per event 20 cm fe
Particle statistics (per event): 20 cm Fe

central Au+Au collisions

at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

particle statistics per event 20 cm fe1
Particle statistics (per event): 20 cm Fe

central Au+Au collisions

at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

momentum distributions 20 cm fe
Momentum distributions (20 cm Fe)

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

problems
Problems
  • TFluka is unstable in cbmroot
  • Present setup of TGEANT4 doesn't include muon production in thick material
  • Is production of secondary particles in absorber material correctly described?

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

modeling additional electron hits
Modeling additional electron hits
  • Create true hit (X0, Y0)
  • If e, create new point (X0+∆X, Y0+∆Y)
  • Create noise hit (Xnoise, Ynoise)
  • Possibility to create more then 1 noise hit from 1 true e

e

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

statistics per event
Statistics (per event)

central Au+Au

collisions at 25 AGeV

?

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

horizontal hit distribution

MC points

―standard

hits

additional e:

―+1

―+2

―+5

―+10

Horizontal hit distribution

central Au+Au

collisions at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

invariant mass spectra
Invariant mass spectra

ω→μ+μ- + central

Au+Au collisions at

25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

results of lit reconstruction
Results of Lit reconstruction

ω→μ+μ- + central Au+Au collisions at 25 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

background
Background

central Au+Au collisions at 25 AGeV

+1e +2e +3e

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

conclusions
Conclusions
  • Simulation tools have been developed to design and optimize CBM muon detection system.
  • The present muon detector design is tested for different collision systems and beam energies (incl. SIS100).
  • Simulations with enhanced yield of secondary electrons have been started. Track reconstruction efficiency decrease slightly with increasing number of secondary electrons up to a factor of 3 which corresponds to an increase of total hit density by more than a factor of 2. Simulations with higher hit densities are in progress.

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

next steps
Next steps
  • Implementation of:
    • realistic detector description
      • different type of the detectors
      • inefficiency of the detectors
    • muon trigger
    • additional secondary electrons with correlated hits in detectors
  • Muon system optimizations:
    • number of sensitive layers
    • thickness of absorbers
    • optimization tacking into account costs
  • Test of possible solutions of muon system using LMVM and charmonium simulations

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

thank you for your attention

Thank you for your attention!

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

backup slides

Backup slides

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

muon system with tof

m2 =

β =

γ =

m2 = P2 ( - 1)

1

P2

β2

(β × γ)2

L

1

c × t

√1 – β2

Au+Au at 8 AGeV

Muon system with ToF

ToF

(80 ps)

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

m 2 vs p reco

signal μ

background

m2 vs. Preco

9 hits

12 hits

9, 12 and 15 hits tracks

15 hits

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

results after tof pid

Au+Au at 8 AGeV

Results after ToF pID

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

possible modifications for increasing of signal acceptance

Au+Au at 8 AGeV

Possible modifications for increasing of signal acceptance

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

1 decreasing magnet field

Au+Au at 8 AGeV

1. Decreasing magnet field

magnet field: 100% 50%

+ 12% μω

+ 22% ω

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

2 decreasing the thickness of the absorbers

Au+Au at 8 AGeV

2. Decreasing the thickness of the absorbers

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

j in p c @ 30 gev pluto and hsd

p+C at 30 GeV

J/ψ in p+C @ 30 GeV: Pluto and HSD

Pluto

HSD

HSD

Pluto

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

results of l1 reconstruction2

p+C at 30 GeV

Results of L1 reconstruction

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

reconstructed j

p+C at 30 GeV

Reconstructed J/ψ

Pluto

HSD

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna

comparison of ideal with realistic detector resolution
Comparison of ideal with realistic detector resolution

σ =100 μm

ω→μ+μ- + central

Au+Au collisions

segmentation

beam energy

── 15 AGeV

── 25 AGeV

── 35 AGeV

12th CBM Collaboration meeting Oct. 13-18 2008, JINR Dubna