data analysis from the cern test experiment about the hades electromagnetic calorimeter
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/1.jpg)
DATA ANALYSIS FROM THE CERN TEST EXPERIMENT ABOUT THE HADES ELECTROMAGNETIC CALORIMETER
By : Tazio TorrieriSupervisor : Vladimir Wagner
![Page 2: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/2.jpg)
PLAN
HADES experiment
The HADES electromagnetic calorimeter
The CERN test experiment
Data analysis and results
![Page 3: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/3.jpg)
HADESHigh Acceptance Di-Electron Spectrometer
![Page 4: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/4.jpg)
HADES
Study of nuclear matter properties at high density : Modification of hadron properties
![Page 5: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/5.jpg)
HADES Detection of electron-positron pair
Extract the invariant mass of light vector mesons (ω, ρ, Φ)
![Page 6: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/6.jpg)
HADES ELECTROMAGNETIC CALORIMETER
![Page 7: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/7.jpg)
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
![Page 8: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/8.jpg)
HADES ELECTROMAGNETIC CALORIMETER Detection of gamma pair :
π0 → γ + γ η → γ + γ
Better π− / e− supression for large momenta
![Page 9: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/9.jpg)
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
![Page 10: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/10.jpg)
CERN TEST EXPERIMENT
![Page 11: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/11.jpg)
CERN TEST EXPERIMENT
![Page 12: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/12.jpg)
DATA ANALYSIS AND RESULTS
![Page 13: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/13.jpg)
Distribution of the energy deposited in the first detector
![Page 14: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/14.jpg)
Electron peakfitting for the first detector
![Page 15: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/15.jpg)
Energy calibration
Energy resolution
Expected resolution :5% / √E (GeV)
![Page 16: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/16.jpg)
Gaussian + Exponential fitting
Gaussian + Parabole fitting
![Page 17: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/17.jpg)
Distribution of the energy deposited in the first detectorafter energy calibration
![Page 18: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/18.jpg)
200 400 600 800 10001200140016001800200022000.700
0.750
0.800
0.850
0.900
0.950
1.000
1.050
e− / π− separation
Series1Series5Series9
Energy (MeV)
π−
sep
/ al
l π−
![Page 19: Data analysis from the CERN test experiment about the HADES electromagnetic calorimeter](https://reader035.vdocuments.net/reader035/viewer/2022070420/56815fba550346895dceb602/html5/thumbnails/19.jpg)
QUESTIONS ?