UCL Atlas Software Work

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UCL Atlas Software Work

• Atlas Fast Simulation (Atlfast)
• Jet Reconstruction Pt.1 (KtJet)
• Jet Reconstruction Pt. 2 (JetRec)
• Physics Analysis Package (PAP)
• Quality Assurance (QA)
• Graphics (JiveXML Atlantis)
• Physics Studies

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UCL Atlas Software Team

• Jon Butterworth
• Jon Couchman
• Janice Drohan
• Nikos Konstantinidis
• Peter Sherwood
• Ben Waugh

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AtlfastJ. Couchman P. Sherwood

• Fast Simulation of Atlas Detector
• Objected Orientated C implementation
• Basic Reconstruction
• Simple Smearing Parameterizations
• Extensions
• Massive Jets
• KT Clustering Algorithm
• Fast Shower

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AtlfastJ. Couchman P. Sherwood
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AtlfastJ. Couchman P. Sherwood
Unsmeared Smeared
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KtJetJ. Butterworth, J. Couchman, B. Waugh B.
Cox (Man.)

• OO implementation of KT clustering Algorithm
• Written in C
• Optimized For Performance
• Identical Results to Fortran
• Much Faster That Fortran
• Easily Extendable
• www.ktjet.org

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KtJetJ. Butterworth, J. Couchman, B. Waugh B.
Cox (Man.)
Program Fortran (DP) KtJet (DP) KtJet (SP)
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KtJetJ. Butterworth, J. Couchman, B. Waugh B.
Cox (Man.)
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KtJetJ. Butterworth, J. Couchman, B. Waugh B.
Cox (Man.)
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JetRecJ. Couchman

• Interface Atlfast With Jet Reconstruction
• Implement KtJet in Atlas Frame Work
• KtJet Main (only?) reconstruction Algorithm!
• Develop new JetRec Algorithms
• Seeded Cone
• Seedless Cone

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PAPJ. Couchman, P. Sherwood

• Common Atlas Analysis Interfaces
• Useful C Utility Programs
• Example Analysis Algorithms

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Atlas QAP. Sherwood

• Improve Productivity By Increasing Quality

• Reviews
• Standards
• Tools
• Documentation

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JiveXML AtlantisJ. Couchman, J. Drohan, N.
Konstantinidis, P. Sherwood,H. Drevermann (CERN)
G. Taylor (Santa Cruz)

• Atlas Graphical Event Display (and much more!)

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Physics StudiesJ. Couchman, J. Butterworth, B.
Cox (Man.) F. Nauyock (Man.)

• WW scattering

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Physics StudiesJ. Couchman, J. Butterworth, B.
Cox (Man.) F. Nauyock (Man.)

• Using Atlfast Generate
• 500K Signal Events
• 5M Background Events
• Use Both Kt and Cone Clustering Algos
• Find Parameters For Best Resolutions
• Compare Results
• Cone to Kt
• Simulated to Generated Events

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Physics StudiesJ. Couchman, J. Butterworth, B.
Cox (Man.) F. Nauyock (Man.)
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Physics StudiesJ. Couchman, J. Butterworth, B.
Cox (Man.) F. Nauyock (Man.)
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