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PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg Schepers
PANDA
Technical Assessment Group PID
Status Report
G. Schepers for the PID TAG
GSI
PID TAGPID TAG
http://wiki.gsi.de/cgi-bin/viewauth/Pandatagpid
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg Schepers
PID @ PANDA
• PANDA @ FAIR
• Global Requirements for PID
• PID TAG work
- Kinematic Studies
- Performance – Separation Power - Efficiency
- Global PID analysis
• Conclusion and Outlook
GSI
PID TAGPID TAG
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
pp- and pA-annihilation
GSI
PANDA @ FAIR
• wide range of momentum - p momentum: 1.5-15 GeV/c - mass range: 0-6 GeV/c • highest intensity - event rate 2 x 10 /s - up to 10 reaction products
• rich physics program
7
2
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
PANDA (PID) Detectors
GSI
PID TAGPID TAG
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg Schepers
• Subject
- Requirements from physics
- Evaluate potential of each subsystem
- Matching of systems
• Deliverables
- Definition of global PID scheme
- Optimized set of detectors and parameters
• Time Frame
- One year from asap ( PANDA Meeting @ DD 9.March 2006)
GSI
Global PID Requirements
PANDA Meeting @ GSI 13. December 2006
Georg Schepers
PANDA Technical Assessment Group PID actual
C. Schwarz, G. Schepers Chair
B. Kopf / R. Nowotny Barrel Calorimeter
R. Kaiser / B. Seitz Forward Cherenkov
O. Denisov / M. P. Bussa / M. Maggiora Muon counter
K. Föhl / P. Vlasov / M.Ehrenfried/ B.Seitz Cherenkov Counter
J. Smyrski / P. Hawranek / O. Wronska Forward Calorimeter
Q. Weitzel / B. Ketzer / S. Neubert TPC
(Carsten Schwarz /Aida Galoyan ) ToF
K. Peters Detectors
GSI
PID TAGPID TAG
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg SchepersGSI
PID TAG WorkPID TAG Work
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg SchepersGSI
Kinematics of the PANDA decay channelsKinematics of the PANDA decay channels
• Important input for common plots for Separation Power
• Solving open questions: - which quality for separation power do we need for different spatial regions ? - do we need a Forward Cherenkov ?
• MC truth studies for the PID - distinction between the different particles IDs
- distinction between different momentum regions : < 1 GeV/c : PID via dE/dx and/or ToF (and TPC) > 1 GeV/c : PID via Cherenkov detectors
- distinction between different spatial regions θ : 0° - 5° : FS- θ : 0° - 5° : Forward Spectrometer (FS) θ : 5° - 20° : forward part of the Target Spectrometer (TS) θ : 20° - 90° : forward part of the barrel region in the TS θ : 90° - 170° : backward part of the barrel region in the TS
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg SchepersGSI
Kinematics of the PANDA decay channelsKinematics of the PANDA decay channels
DPM @ 2.0 GeV/cDPM @ 15.0 GeV/c
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
Do we need a Forward Cherenkov?
GSI
PID TAGPID TAG
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
Forward Cherenkov
GSI
PID TAGPID TAG
Forward RICH angles: 0-5/10deg
pions: 0.5 - 16 GeV/ckaons: 2 - 16 GeV/c
protons: 2 - 20 GeV/cthickness 1.2m =~ 0.11 Xo
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg Schepers
6 Parameter Analysis Endcap DIRCEndcap DIRC
GSI
Performance – Separation Power - Efficiency
K – π - Separation Power:σ - lines as function of θ and p1
2
34
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
Performance – Separation Power - Efficiency
Example : Endcap DIRC
GSI
Distribution and Resolution of β
Separation Power ( θ, p)
Efficiency K
π
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg SchepersGSI
Barrel DIRC
• Pin hole
• Focussing DIRC
• Time Of Propagation 3D DIRC
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg SchepersGSI
DIRC ParametrizationDIRC Parametrization
Separation Power =l m1²-m2² l / (2 p² σ-track(θ) sqrt(n*n-1)) Path length [cm] Photons produced
Separation Power vs p vs θ
p θθ
θ
p
pEfficiency
p θ
θ
p
p
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg SchepersGSI
TPCTPC
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
TPC Parametrization dE/dx
GSI
TAG-PIDTAG-PID
Seperation Power = 2 l I1-I2 l / (sigmaI1/I1 + sigmaI2/I2)
I is dE/dx of the resp. particle. (resolution 5%)
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
GSI
(Barrel) EMC electron ID Studies(Barrel) EMC electron ID Studies
• Full simulation chain in BaBar like software - G4 simulation with the complete detector, digitization, full reconstruction for the EMC - single particles between 0.05 … 6.0 GeV/c and cos() =-0.7 … 0.7
- 10k e+
- 10k +
• Electron can be identified via- E/p (E: energy deposit of the cluster; p: reconstructed momentum of the track)- shower shape of the cluster
• Studies based on- complete EMC reconstruction
- reconstructed energy deposit of the cluster- reconstructed shower shape of the cluster (Zernike moments)- events with only one cluster - tracking not taken into account yet
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
GSI
(Barrel) EMC electron ID Studies – Training Neuronal (Barrel) EMC electron ID Studies – Training Neuronal NetworkNetwork
e π Κ+ + +
eπΚ
+++
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
GSI
(Barrel) EMC electron ID Studies – Results(Barrel) EMC electron ID Studies – Results
e+
+
e+
+
all all all
cut cut cut
Κ+
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
GSI
(Barrel) EMC electron ID Studies – Results(Barrel) EMC electron ID Studies – Results
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
GSI
(Barrel) EMC electron ID Studies - Outlook(Barrel) EMC electron ID Studies - Outlook
• Electron ID via e/p and shower shape seems to work
• PID for p < 0.8 GeV/c to be improved
• need of precise test beam data and Monte Carlo models
• optimal training of the neuronal network necessary
• combination with other detectors (e.g. dE/dx, tof, cherenkov)
• studies with different crystal sizes
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg SchepersGSI
Forward Calorimeter
Up 5 GeV/c down 1 GeV/c
The Forward EMC can be treated in the same way as the Barrel EMC
The groups from Bochum and Crocow work already on common simulations
PANDA Meeting @ GSI 13. December 2006
PID TAG
Georg SchepersGSI
Forward Calorimeter
Objectives of the Shashlyk Calorimeter π/e discrimination energy, position and time measurement
TPR Layout of a Shashlyk module
100 ps / sqrt(E) Time resolution
4.% / sqrt(E) Energy resolution
110 x 110 mm2Lateral dimensions
20 X0 Radiation depth
59.8 mm Effective Moliere radius
0.275 mm Lead layer thickness
1.5 mm Scintillator layer thickness
378Number of layers
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg SchepersGSI
Barrel ToF
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg Schepers
Muon Counters
GSI
PID-TAGPID-TAG
Different Strategies for muon identification in different momentum regions must be envisaged for muon detectors only out side the iron yoke:
E mu < 1GeV : muons can not reach the muon trackers => identification Barrel DIRC, Barrel EMC E mu > 1 GeV : identification feasible by means of muon trackers (gaseous detectors)
Basic detector features The bacis detector features for the muon trackers will be:
Ar, CO2, CF4 Gas mixture
25 nsec Double hit resolution
100 nsec Maximal drift time
1 cm Single plane space resolution (pitch size)
2-4 nsecTime resolution
Layer # 27
Layer # 7
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg Schepers
Muon Counters
GSI
PID-TAGPID-TAG
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg Schepers
Global PID Analysis
GSI
PID-TAGPID-TAG
• Evaluation for Global PID analysis for PANDA already started - number of PID variables ? - number of PID stages ? - combinations of detectors…
• Approches - Maximum Likelihood - method from other experiments compared (HERMES, Belle)
• First Conclusions taken: - Need of probability functions from test beam and simulations from all PID detectors and some traking input (e.g. p, θ) - Likelihood approach seems to be flexible enough - Analysis with Neuronal network interesting either as Global PID Analysis or as input for Likelihood method
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg SchepersGSI
Conclusion for the PID TAG
• Separation Power parametrization and Efficiency determination prepared for some detectors for the others in progress
• Kinematic Plots for Benchmak channels available - background studies has to be done
• Questions : - Forward Cherenkov - positiv - TPC helpful as PID detector especially in low mommenta regions
• Concepts for Global PID Analysis under evaluation
PANDA Meeting @ GSI 13. December 2006
PID-TAG
Georg Schepers
GSI
Outlook
Next Steps:
• Need of precise detector tests and elaborated MC methods
• Need the Matching of - detector response functions - PID detectors with output from the tracking detectors
PANDA Meeting @ GSI 13. December 2006
TAG-PID
Georg Schepers
C. Schwarz, G. Schepers Chair
B. Kopf / R. Nowotny Barrel Calorimeter
R. Kaiser / B. Seitz Forward Cherenkov
O. Denisov / M. P. Bussa / M. Maggiora Muon counter
K. Föhl / P. Vlasov / M. Ehrenfried Cherenkov Counter
J. Smyrski / P. Hawranek / O. Wronska Forward Calorimeter
Q. Weitzel / B. Ketzer / S. Neubert TPC
(Carsten Schwarz/Aida Galoyan ) ToF
K. Peters Detectors
Thanks for important input:
M. Düren, K. Götzen, Th. Hennino a.o.
GSI
PANDA Technical Assessment Group PID