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Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter

Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter. By : Tazio Torrieri Supervisor : Vladimir Wagner. plan. HADES experiment The HADES electromagnetic calorimeter The CERN test experiment Data analysis and results. HADES.

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Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter

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  1. Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter By : TazioTorrieri Supervisor : Vladimir Wagner

  2. plan • HADES experiment • The HADES electromagneticcalorimeter • The CERN test experiment • Data analysis and results

  3. HADES High Acceptance Di-Electron Spectrometer

  4. HADES • Study of nuclearmatterpropertiesathighdensity : • Modification of hadron properties

  5. HADES • Detection of electron-positron pair  Extract the invariant mass of light vectormesons (ω, ρ, Φ)

  6. HADES electromagneticcalorimeter

  7. HADES electromagneticcalorimeter • Aim : Improvement of the signal from light vectormesons by removing the background. • Two main sources of background : • π0 → γ + e− + e+η → γ + e− + e+Dalitzdecay ≈ 1.2 % • Charged pions

  8. HADES electromagneticcalorimeter • Detection of gamma pair : • π0 → γ + γ • η → γ + γ • Betterπ− / e−supression for large momenta

  9. HADES electromagneticcalorimeter • Replace the HADES pre-shower detector • Placedat 2.40 m from the target • 8m² required • Angle covering : 18° < θ < 45° • ≈ 840 lead glass modules from OPAL experiment • Module dimensions : 42 x 9.2 x 9.2 cm

  10. CERN test experiment

  11. CERN test experiment

  12. Data analysisand results

  13. Distribution of the energydeposited in the first detector

  14. Electron peak fitting for the first detector

  15. Energy calibration Energyresolution Expectedresolution : 5% / √E (GeV)

  16. Gaussian + Exponentialfitting Gaussian + Parabole fitting

  17. Distribution of the energydeposited in the first detector afterenergy calibration

  18. Questions ?

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