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D ATA ANALYSIS FROM THE CERN TEST EXPERIMENT ABOUT THE HADES ELECTROMAGNETIC CALORIMETER By : Tazio Torrieri Supervisor : Vladimir Wagner.

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Presentation on theme: "D ATA ANALYSIS FROM THE CERN TEST EXPERIMENT ABOUT THE HADES ELECTROMAGNETIC CALORIMETER By : Tazio Torrieri Supervisor : Vladimir Wagner."— Presentation transcript:

1 D ATA ANALYSIS FROM THE CERN TEST EXPERIMENT ABOUT THE HADES ELECTROMAGNETIC CALORIMETER By : Tazio Torrieri Supervisor : Vladimir Wagner

2 PLAN HADES experiment The HADES electromagnetic calorimeter The CERN test experiment Data analysis and results

3 HADES High Acceptance Di-Electron Spectrometer

4 HADES Study of nuclear matter properties at high density : Modification of hadron properties

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

6 HADES ELECTROMAGNETIC CALORIMETER

7 Aim : Improvement of the signal from light vector mesons by removing the background. Two main sources of background : π 0 → γ + e − + e + η → γ + e − + e + Dalitz decay ≈ 1.2 % Charged pions

8 HADES ELECTROMAGNETIC CALORIMETER Detection of gamma pair : π 0 → γ + γ η → γ + γ Better π − / e − supression for large momenta

9 HADES ELECTROMAGNETIC CALORIMETER Replace the HADES pre-shower detector Placed at 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

12 D ATA ANALYSIS AND RESULTS

13 Distribution of the energy deposited in the first detector

14 Electron peak fitting for the first detector

15 Energy calibration Energy resolution Expected resolution : 5% / √E (GeV)

16 Gaussian + Exponential fitting Gaussian + Parabole fitting

17 Distribution of the energy deposited in the first detector after energy calibration

18

19 Q UESTIONS ?

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