Calibration software for the HADES electromagnetic calorimeter (EMC)
Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter
description
Transcript of Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter
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DATA ANALYSIS FROM THE CERN TEST EXPERIMENT ABOUT THE HADES ELECTROMAGNETIC CALORIMETER
By : Tazio TorrieriSupervisor : Vladimir Wagner
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PLAN
HADES experiment
The HADES electromagnetic calorimeter
The CERN test experiment
Data analysis and results
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HADESHigh Acceptance Di-Electron Spectrometer
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HADES
Study of nuclear matter properties at high density : Modification of hadron properties
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HADES Detection of electron-positron pair
Extract the invariant mass of light vector mesons (ω, ρ, Φ)
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HADES ELECTROMAGNETIC CALORIMETER
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HADES ELECTROMAGNETIC CALORIMETER
Aim : Improvement of the signal from light vector mesons by removing the background.
Two main sources of background :
π0 → γ + e− + e+ η → γ + e− + e+ Dalitz decay≈ 1.2
%Charged pions
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HADES ELECTROMAGNETIC CALORIMETER Detection of gamma pair :
π0 → γ + γ η → γ + γ
Better π− / e− supression for large momenta
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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
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CERN TEST EXPERIMENT
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CERN TEST EXPERIMENT
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DATA ANALYSIS AND RESULTS
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Distribution of the energy deposited in the first detector
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Electron peakfitting for the first detector
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Energy calibration
Energy resolution
Expected resolution :5% / √E (GeV)
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Gaussian + Exponential fitting
Gaussian + Parabole fitting
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Distribution of the energy deposited in the first detectorafter energy calibration
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e− / π− separation
Series1Series5Series9
Energy (MeV)
π−
sep
/ al
l π−
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QUESTIONS ?