LCD Reconstruction/Simulation Status
Tony Johnson
November  22nd 1999

Reconstruction

Track Finding/Fitting - Status
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

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

Reconstruction Speed

Recent/Current Recon Work
Ron Cassell working on Standard Test Suite
Simulation first, then recon
Gary bower working on interface to Guinea Pig
Should give ability to work with real background overlays
New version of Kalman Filter from Rob Kutschke
Received November 2, not looked at yet.
Not much progress since SLAC meeting in August
Nic Sinev now working on BaBar
Mike Ronan working on analysis/track-cluster association

Standalone Recon
Plan to make Recon run in standalone package
Read SIO file generated by Gismo
Write SIO file including recon output
Analyzable in JAS or Root
Diagnostic histograms built in
Run Recon after Simulation as part of Farm operations
Need to define “standard” set of algorithms and parameters.

To Do List
Finish integration of MCFast Kalman filter
Support for merging signal/backgrounds (Gary Bower)
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 (Tony Waite)
Switch to XML based geometry description
Small Angle Tracking
Reference Analyses (in progress Ron Cassell)

Access to Code - CVS
Recon code recently moved to CVS for universal access
Most development currently done on NT
Now Unix development should be easy too
Browse CVS repository on Web
Connect with you favorite CVS client
protocol: pserver
server: sldl1.slac.stanford.edu
cvsroot: /nfs/slac/g/jas/lcdroot
userid: anoncvs
password: jascvs
module: lcd

Simulation

Simulation Status
Currently producing new set of data
Incorporates all known Gismo bug fixes
Still using S1 and L1 detectors
10,000 tt events for Small, Large done (at Penn)
More coming soon
Tony Waite has new release of Gismo available for download:
All known gismo bug fixes
Built using DEC code management system
Guinea pigs trying it out at (Penn, Michigan, Colorado)

Recent/Current Simulation work
Joanne Bogart working on XML detector descriptions
Some porting issues slowing down deployment
Tony Waite working on SIO (ready to go)
Manpower issues slowing down progress
Some substantial part of group migrating to GLAST.
Maybe some replacement manpower at SLAC?
Intention to move to S2,L2 full simulation
Incorporating XML, SIO
ASAP

Other News
Web Site Update
I’m in the middle of updating the web site at:
http://www-sldnt.slac.stanford.edu/nld
Suggestions/Contributions welcome
Please enter yourself into the LCD People Database (using web interface).
Ongoing LCD Tutorials
Aimed at attracting more interest/manpower
Babar tutorial at SLAC 11th November
Tutorials at FNAL, Cornell in January 2000