PANDA collaboration meeting2.-4. June 2004 simulation statusOverview New Framework why status schedule Simulation subdetector Forward spectrometer

PANDA collaboration meeting 2.-4. June 2004

simulation statusOverviewOverview

• New Framework why status schedule

• Simulation subdetector Forward spectrometer EMC (TS)

• Status PID

• Benchmark channel Status


simulation statusNew FrameworkNew Framework

• not enough manpower for development

• switch to well proved framework only few on the market

• decision: BaBar framework • experiences in PANDA collaboration

• request to BaBar computing management O.k but with Copyright



• object-oriented

• environment: Compilation time for develpment shorter

• digitization, event-mixing, detector response

• reconstruction: vertexing , tracking, PID

• analysis: many fit routines available

Advantages



Simulation Architecture



Status

• PANDA source code in new environment embedded (done)

• implementation in CVS (done)

• removal of database (30% done)

• implementation of detector geometry in Bogus removal of BaBar geometry: dummy version (done) implementation of PANDA geometry (to do)

• modification of reconstruction & analysis (to do)



Time schedule

• idea: study of benchmark channels for TR in new framework

• deadline event production: Second week of August

• implementation has to be finished until beginning of August


simulation statusDetector development: FSDetector development: FS

• simulation and reconstruction of EMC (FS) is working

• idealized setup: appr. 11000 PWO crystals

• implementation of more realistic setup has to be done lead glass calorimeter?

(talk in subgroup meeting: Piotr Hawranek)


simulation statusDetector development: FSDetector development: FS

• new idea: Forward dipol (HERMES) iron plate shields the beam from the dipol field

• advantage: no dipol behind FS

• disadvantage: no acceptance between 0°-1°

• first calculations: magnetic field: 1T beam region: 100 mT

HERMES: Side view of dipol with shielding


simulation statusDetector development: EMC (TS)Detector development: EMC (TS)

events8

• gamma-efficiency vs. space between crystals• default value: 2.0 mm• space variation: 2.0mm-0.3mm• 2000 events simulated:

• eff. increases dramaticaly by reducing the space• target point geometry• modification: point of intersection app. 2cm backward

cGeVpp /5@822 0


simulation statusReconstruction: PIDReconstruction: PID

• PID problem with DIRC and RICH

• different efficiency for positive and negative particles

• reco with old tracker interface

• modified reconstruction: PID works properly

(Carsten Schwarz, GSI)


simulation statusBenchmark channelBenchmark channel

copp @62,2,3 00 (Jan Zhong, Bochum)

• problem: assignment of gammas to corresponding mesons

• possiblilities:

• requirement: No kinematic fit spatial & energy resolution for each setup

• strategy: Probabilities for each hypothesis

ji

ij mm

,2

22

30

0

0

)(

45:2,2

15:300

0


simulation statusBenchmark channelBenchmark channel(Jan Zhong, Bochum)

• calculation and via

• best combination least

• cuts total energy, momentum

• efficiency: more than 20%

0 M

2/1.70 cMeV

2/7.1340 cMeVM

152

3 0

2

3 0

copp @62,2,3 00

]/[ 2cMeVM

2

3 0(talk in subgroup meeting)



(Alexander Golischewski, Bochum)(Agnes Lundborg, Uppsala)

2 cpp

• comparison: EMC setup with constant crystal length and extended cystal length

• improved efficiency and resolution with extended crystal length

• background studies still under investigation

500:50:1:: 000 c

]/[ 2cGeVM



(Francesca Ottone, Pavia)0sc KKpp

• 10000 events analysed with

• cuts energy 2.479 <E(CM)<3.479 GeV momentum P(CM)<0.5 GeV position of vertex D0<0.5mm; -0.5mm<Z0<0.5mm distance: primary to vertex < 2.5mm

]/[ 20 cGeVMsKK

[mm] K vertex :distance 0s

0SK

0SK



(Andrei Sokolov, GSI/Giessen)cGeVDDpp /8@

• • selector for most important D°-decay modes• mass difference method

improvement of resolution

• still problems: Kaon & Pion identification matching: charged particles

with Cluster in EMC(TS)

]/[ 2

)(cGeVM

K

00* DPDG

Dinv

Dinv MMM

(talk in subgroup meeting)

0* DD



(Marco Destefanis, Giessen)cGeVpp /4@

• asymmetry in efficiency:

• lifetime 60mm instead 78.9mm no energy loss in track reco new framework: Kalman fitter

][GeV/c and of Masses 2

than more 10%

(talk in subgroup meeting)


simulation statusAgenda Agenda

Simulation subgroup meeting June 2th

• 15:30-15:36: General

• 15:36-15:50: Status of new framework (Matthias Steinke)

• 15:50-16:04: Simulation of FS (Piotr Hawranek)

• 16:04-16:18: (Andrei Sokolov)

• 16:18-16:32: (Olaf Hartmann)

• 16:32-16:46: (Jan Zhong)

• 16:46-17:00: (Marco Destefanis)

cGeVDDpp /8@

Xpp

cGeVpp /4@

copp @62,2,3 00

Documents

PANDA collaboration meeting2.-4. June 2004 simulation statusOverview New Framework why status schedule Simulation subdetector Forward spectrometer