ALICEPMD SIMULATION

1
ALICE-PMD SIMULATION

• Present Status
• OS RedHat Linux 7.2
• Compiler gcc-3.2
• ROOT 3.03/09
• needs compilation
• Aliroot new
• GEANT3 out of Aliroot

2
ALICE-PMD SIMULATION
Pb
preshower
CPV
fireball
pi0
eventgenerator

• Keep track of all the way from vertex to Edep
• 3 ways
• fIshunt 0, decay informations at all
  stages
• 1, only mother particle at
  the vertex
• 2, last particle
• Switch in AliPMD

3
ALICE-PMD SIMULATION

• Event Generator
• Parametrized Hijing
• Input - of tracks
• Output all sorts of particles, eg. pi0,
  pi-, etc.
• Previous pmdlib
• pi0 decays into photons
• fIshunt 1
• Now hijingParam
• SetPi0Decays(kTrue)
• fIshunt 0
• Tracking
• For other event generators, tracking should
  be ON.
• setTrackingFlag(1)

4
ALICE-PMD SIMULATION

• Reconstruction
• PMDDigitization
• - independent class
• - reads the ROOT file
• - extract all the vertex and hits info
• - pass the info to Clustering class
• - book vert, hits and cluster info into a
  ROOT ntuple
• - 3 minutes (1GHz)
• PMDClustering
• - independent class
• - input hits info, output- cluster info
• - 15 minutes for one central event (31K
  tracks, 1GHz)

5
ALICE-PMD SIMULATION

• Analysis
• - macro pmdanal.C
• - reads the ROOT ntuple file
• - correlate the cluster info with
• parent PID
• - calculates occupancy, deta-dphi etc.
• Documentation
• http//www.veccal.ernet.in/pmd/ALICE/reconstruc
  tion/reconstruction.html
• http//www.veccal.ernet.in/pmd/ALICE/analysis/
  analysis.html

6
ALICE-PMD SIMULATION

• To be done
• p-h Discrimination
• MIP Cut
• Efficiency, Purity done
• NN Algorithm
• Efficiency, Purity needs
  programming
• Embedding (track/cluster)
• needs programming
• model independent way
• Other study
• Cluster splitting
• Delta Ray cut
• To be imported to ALICE reconstruction
  framework

7
ALICE-PMD SIMULATION

• Time Line
• - by the end of January 2003
• Man Power
• - were 2 (Basanta, Bedanga)
• - now 1 ( as Bedanga is leaving for BNL)
• - need some help from student
• Any volunteer ?