Status of LCD Reconstruction/Analysis Software (hep.lcd package)

Tony Johnson

SLAC

August 5th 1999

Contents

• Status of hep.lcd package
  • Emphasis on what’s new since Michigan
  • Reconstruction Speed

• What’s new in JAS 2.0

• What’s on our To Do List

• Questions for Discussion

PPT Slide

LCD Road Map

fastMC (JAS)

JAS analysis

Gismo

Full Recon

Root parser

JAS parser

fastMC (Root)

JAS parser

Root parser

Generator(s)

What is hep.lcd?

• A Java Framework for
  • Running Reconstruction and/or FastMC
  • Analysis of LCD data from Stdhep, Gismo, FastMC

• A Tool for
  • Rapid Development of Reconstruction Algorithms

• A Suite of Physics Analysis Tools
  • Histograming, Event Display, Jet Finding, etc.

• Emphasis on Flexibility and Extensibility
  • Typically provide multiple algorithms
  • Support for Large + Small + ...

• Can be used standalone or inside Java Analysis Studio

What is Java Analysis Studio?

Why Java?

• Modern Object-Oriented language

• Easy to learn and use

• Very Suitable for Rapid Prototyping

• No problems with porting code to new platforms

• Can use Java Analysis Studio for interactive analysis

Track Finding/Fitting

• Track Reconstruction
  • Track Finding uses M.Ronan’s (TPC) pattern finding
    • Tuned for Large + Small detector
  • Track Fitters:
    • SLD Weight Matrix Fitter
    • Kalman Filter coming soon
      • Fortran not Java, will need native library for each platform
    • Can do Single Detector or Combined fit (e.g. VTX+TPC)

• Hit Smearing/Efficiency (since Gismo gives “perfect” hits)

• Random Background overlay

• What’s still needed
  • More Track Finding Algorithms (Cheater, Projective Geometry)
  • End Cap tracking

Example of Using Track Recon.

Cluster Finding

• Three Clustering Algorithms Currently Implemented
  • Cluster Cheater (uses MC truth to “cheat”)
  • Simple Cluster Builder (Touching Cells)
  • Radial Cluster Builder
    • All algorithms tend to produce many very low energy clusters - important to set sensible thresholds

• Still Needed - Cluster Refinement Stage
  • Combine HAD + EM clusters
  • Endcap + Barrel overlap region

• In Progress - Track Cluster Association
  • Initial Implementation Done by Mike Ronan
  • Output Format defined by Gary Bower
  • Need to Extend Definition of Clusters
    • Directionality, Entry point to calorimeter

Shower Parameterization

Reconstruction Speed

Fast MC

• Can read StdHEP (generator files) or Gismo output

• Produces tracks from MC particles based on parameters provided by Bruce Schumm
  • Now produces (diagonal) Error Matrix
  • Output compatible with Output from Full Recon

• No Calorimeter Simulation at Present

• Future? - Depends on level of interest

Other Features

• 3-Vector/4-vector utilities (G.Bower)

• Jet Finding/Event Shape Utilities (G.Bower)

• “Contrib” Area - for contributed useful user code
  • MC event classification (M.Ronan)
  • Sample Track Analysis (M.Ronan)
  • Event Dump Utility (D. Wagner)
  • Two Body Mass Reconstruction (D. Wagner)
  • “Gaussian Box” Function (for SUSY Energy Dists.)
  • Your Code Here

• Event Display

• Particle Hierarchy Display

Event Display

Bugs

• Gismo Bug truncates MC particle hierarchy to 10 levels
  • Fixed in Gismo now
    • Most Datasets produced with old version of Gismo

• Errors in ParticleProperties table
  • u,d quarks reversed, masses in MeV instead of GeV, other errors?
  • Fixed in JAS 2.0

• MC parent/child relationships confusing

Status of hep.lcd package

• Current Release 0.99

• Version 1.0 ready within 1-2 weeks will include
  • Kalman Filter
  • Random Backgrounds

• Web Site
  • http://www-sldnt.slac.stanford.edu/jas/documentation/lcd
  • Code download
  • Release Notes
  • Tutorial (reasonably up to date)
    • Includes User Feedback
  • Notes on Data Availability

To Do List

• Finish integration of MCFast Kalman filter

• Support for merging signal/backgrounds

• Additional Track Finders (projective, “cheater”)

• Improved Cluster Description

• Track/Cluster Association

• Cluster Refinement

• Vertex Finding code (based on ZVTop?)

• WIRED Event Display

• Support for SIO format reading/writing

• Switch to XML based geometry description

• Small Angle Tracking

• CVS for code management?

• Reference Analyses

New Features in JAS 2.0

• Many bug fixes - Printing Works - Save Histograms as GIF’s

• Easier to install LCD extensions
  • no need to edit jas.ini

• Support for logging output to a file

• Supports 2D Binned Histograms (in addition to 1D Histograms and Scatter Plots)

• Standalone jobs can save histograms (for later viewing in JAS)

• Local jobs can append multiple datasets

• Built-in LCD documentation/help

• Gotcha’s for LCD users
  • Must use JAS 20 version of lcd.jar (in lcd download area)
  • Cannot connect to old servers (SLDNT0 OK)

JAS 2.0 - Available from Secret URL

Questions?

• Should we start to run Reconstruction as part of Standard Production (farm) Running?
  • If so which algorithms/parameters?

• Should we (continue) to have (weekly) phone meetings?

• What else should be on the To Do list?

Conclusions

• There is plenty still to do, but what is done works and is usable so there’s no excuse not to get started on some serious analysis studies.