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PANDA. Ulrich Wiedner, FAIR PAC meeting, March 14, 2005. PANDA Collaboration. • At present a group of 340 physicists from 46 institutions of 14 countries. Austria – Belaruz - China - Finland - France - Germany – Italy – Poland – Russia – Spain - Sweden – Switzerland - U.K. – U.S.A.

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Ulrich Wiedner, FAIR PAC meeting, March 14, 2005.

PANDA Collaboration

• At present a group of 340 physicists

from46 institutions of 14 countries

Austria – Belaruz - China - Finland - France - Germany – Italy – Poland – Russia – Spain - Sweden – Switzerland - U.K. – U.S.A..

3 new members

Basel, Beijing, Bochum, Bonn, Catania, Cracow, Dresden, Edinburg, Erlangen, Ferrara, Frankfurt, Genova, Giessen, Glasgow, GSI, Inst. of Physics Helsinki, FZ Jülich, JINR, Katowice, Lanzhou, LNF, Mainz, Milano, Minsk, TU München, Münster, Northwestern, BINP Novosibirsk, Pavia, Piemonte Orientale, IPN Orsay, IHEP Protvino,

PNPI St. Petersburg, Stockholm, Dep. A. Avogadro Torino, Dep. Fis. Sperimentale Torino, Torino Politecnico,Trieste, TSL Uppsala, Tübingen, Uppsala, Valencia, SINS Warsaw, TU Warsaw, AAS Wien

Unfortunately we lost KVI.

Spokesperson: Ulrich Wiedner - Uppsala

Main physics goals
Main Physics Goals

  • Charmonium spectroscopy

  • QCD exotics

  • Hypernuclear Physics

  • Charm in Nuclei

… base program for the first few years.


Luminosity: L = Npbar • f • xtarget

Envisaged luminosity: L = 2×1032 cm–2s–1

Required target thickness: 5×1015 cm–2

Hydrogen pellet target.

Cluster jet target.

Targets for hypernuclear physics.

Pellet target working principle and result

1 mm

Pellet target: working principle and result

Pressure - a measure

for the pellet rate

Experimental pellet distributions

Predicted beam pipe vacuum
Predicted beam pipe vacuum

pumps at both ends of PANDA

additional pumping between solenoid and dipole

Pellet tracking system
Pellet tracking system

under investigation:

line scan camera provides

online information on

pellet position <100 µm

Targets for hypernuclear physics

pp  

Targets for Hypernuclear Physics

Primary target:

Secondary target:

stopping of 

MC simulation of 


under large angles

Stopping points for (INC calulations)

The electromagnetic calorimeter

lower light yield

slower and more expensive

The Electromagnetic Calorimeter


Fast, high resolution scintillator for  between 10 MeV - 2 GeV

Two possible solutions:

PbWO4 (PWO) crystals

BGO crystals

Crystal size: 22 cm2 22 X0

Pwo crystals
PWO crystals

light yield of PANDA crystals

better than as CMS crystals

For comparison bgo crystals
For comparison: BGO crystals


Light yield ~ 8 times higher than PWO

Readout device apd
Readout device: APD

CMS uses 5x5 mm2 APDs


10x10 mm2 APDs being

developed by Hamamatsu

Preliminary tests show

no significant differences.

Alternative readout devices like the PLANACON hybrid photomultiplier have been tested but show sensitivity to magnetic fields.

Expected performance pwo calorimeter

st / ns

Expected performance (PWO calorimeter)

Measurements with a tagged photon beam in Mainz:

deposited energy / GeV

The mechanical design
The Mechanical Design

Barrel part:

2.5 m long, Ø 1.08 m, 11360 crystals

End caps:

upstream: Ø 0.68 m, 816 crystals

downstream: Ø ~2 m, 6864 crystals

Cooling to -25 C, temperature stabilized to ±0.1 C

The forward emc
The Forward EMC

Shashlyk modules composed of lead absorbers and scintillators

Charmed hybrid j pc 1 channel


pp  g





e+e– (µ+µ–)


Charmed hybrid (JPC=1–+) channel

Production mode:

Invariant mass spectra
Invariant mass spectra





Open charm channels
Open charm channels

D*(2010)+ D*(2010)–


D0 decays

Reconstructed 4040 mass
Reconstructed (4040) mass


The PANDA collaboration is healthy and eagerly waiting

to build up the experiment and to do world-class physics.