Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Athena-Atlfast

J. Couchman 1

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Athena-Atlfast

• Status • Shower Parameterization • Energy Pileup • Kt Cluster + JetRec interaction • Persistency + ADL 2

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Status

• Latest Release : 4.2.0

• Known Problems : None • Comparison With Fortran-Atlfast: Good Match Achieved!!

Problem matching Generators Ordering of Particle Isolation Important People working on analysis 3

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Shower Parameterization

•Working with Kambiz Mahboubi • Distributes particles energy throughout the ECal and HCal • Depends on particle type and where it hits in cell.

• Also implemented Energy Pileup in both ECal and HCal • http://butler.physik.uni-mainz.de/~mahboubi/index.html

4

Signal Shapes

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Kt Cluserting Algorithm

• KT++ - Versatile Jet Clustering package Many Recombination Schemes Sub-Jet Analysis • Integrated with Atlfast (done, not in release) • Written as a JetRec Package (underway) • Full interaction of Atlfast and JetRec Atlfast-ProtoJet (done) Problems with dependencies 6

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Persistency

• Ran on DC0 persistified HepMC Events • Write AtlfastEvent Objects in ADL Cell Track Jet Reconstructed Particle Cluster • Problems with ADL (maybe fixed?) • Unknown timescale for completion.

9

Atlas UK Computing and Offline Meeting 29 th August 2002, UCL

Conclusions

• Atlfast Appears in Good Shape • Shower Param. and E-pileup by end sept.

• Kt Clustering and JetRec within 2-3 weeks • Persistency on its way! (reliance on ADL) • Need more users!

• Web Pages – http://www.hep.ucl.ac.uk/atlas/atlfast – – http://www.ktjet.org

http://butler.physik.uni-mainz.de/~mahboubi/index.html

10