org.lcsim ILC Reconstruction and Analysis Tony Johnson SLAC March 2005

org.lcsim ILC Reconstruction and Analysis Earlier Packages  hep.lcd Reconstruction and Analysis  LCIOPlugin Goals of org.lcsim Components  Conditions Handling  Geometry Access  Event Access  Reconstruction  Analysis Tools  JAS Plugin Accessing Code Status and Plans

hep.lcd Overview Java based analysis reconstruction and analysis package  In use for 5+ years  Runs standalone or inside JAS  Full Reconstruction (tracking+calorimetry)  Analysis Tools (including WIRED event display)  Fast MC Smeared tracks and calorimetry clusters  Physics Tools (Vertex Finding, Jet Finding)  Beam Background Overlays  Contributed Area Analysis Utilities and sample analyses provided by users

hep.lcd Physics Utilities Physics Utilities  4-vector, 3-vector classes  Event shape/Thrust finder  Jet Finders Many kT algorithms implemented (e.g. Jade and Durham ) Extensible to allow implementation of other algorithms  Topological Vertexing Implementation of SLD’s ZVTOP Event Generators Framework  Diagnostic Generator User-defined particle mix, momenta and vertices.  Framework for reading stdhep files  Generator interface for direct connection to (fortran) event generators PYTHIA, HERWIG, ISAJET, … Beam background overlay

Full Reconstruction Tracking  Hit Smearing/Efficiency (detector simulation puts out “perfect” hits)  Random Background overlay  Track Finding: Full pattern recognition in the Central Barrel region  Tuned for Large and Silicon Detectors  Track Fitters:  SLD Weight Matrix Fitter  Can do Single Detector or Combined fit (e.g. VTX+TPC) Calorimetry  Cluster Finding Several Clustering Algorithms Currently Implemented Cluster QA package developed  Cluster Refinements Combine HAD + EM clusters Endcap + Barrel overlap region Identify cluster as originating from charged/neutral hadron, EM

Recent improvements to hep.lcd Ported to work with JAS3 (T. Johnson) New digitization routines being added (N.Sinev) Cluster identification code (G. Bower) Cluster diagnostic package (R. Cassell) Improved Stepper (C. Milstene) Forward Tracking (N. Graf) Flavour Tagging (D. Jackson) Particle ID (B. Wilson, S. Rolnick) Support for Non-Projective geometries (G. Lima) “Garfield” track-finder ( E. von Toerne et al)

hep.lcd analysis tools Tutorial:

hep.lcd package pros-and-cons Features:  Can run standalone or inside JAS  Runs on almost any platform  No dependencies on pre-installed software or network connections. Can install and run in <15 minutes from Snowmass 2001 CD Problems:  IO based on old LCD SIO format  No way to write output from reconstruction  Dependent on old geometry description (detector.ini) limited to cylindrical dectectors

LCIO plugin for JAS3 Works with any LCIO file Diagnostic tools allow to step through and view events

LCIO plugin for JAS3 Event Analysis Wizard will create outline of analysis, and can include sample analysis code. Main routine allows running outside of JAS

Using WIRED with LCIOPlugin LCIO files can (but don’t necessarily) contain positions of all hits, but no detector geometry info except “detector name” LCIOPlugin+WIRED can view hits for any file, but these are hard to visualize without detector  LCIOPlugin can read external HepRep2 file describing detector geometry Location currently needs to be specified HepRep file (xml) can be generated:  by hand (quite easy for simple geometry)  by Geant4 using HepRep2 writer (perhaps with some filtering to remove excess details)  By program using Java or C++ HepRep API

LCIOPlugin with WIRED4

LCIO Plugins pros-and-cons Features:  Not dependent on any detector specific assumptions  Simple environment for debugging problems with LCIO and writing simple analysis routines  Detector independent event display Problems:  No connection to reconstruction or analysis tools  Detector geometry must be specified by hand  Existing LCIO API does not emphasize user-friendliness

org.lcsim Reconstruction and Analysis package

org.lcsim Goals Retain core functionality from hep.lcd package  Full suite of reconstruction and analysis tools available to all LCIO users Update to use LCIO for IO and as basis for simulation, raw data and reconstruction event formats  Isolate users from raw LCIO structures Update/simplify framework using experience from hep.lcd  Provide good tutorial documentation Internationalization  Try to make package independent of detector, geometry assumptions so can work with any detector  Read properties of detectors at runtime Update to Java 1.5  Many improvements since hep.lcd framework was created. Ability to run standalone or in JAS3

org.lcsim Conditions Database Goal: Using “detector name” in LCIO file  Provide access to a extensible set of conditions including: Detector Geometry Algorithm Specific Constants  E.g. FastMC smearing parameters  Don’t make assumptions about format of data  Don’t rely on internet access, or local database installation  Make it easy for users to define new detectors

org.lcsim Conditions Database: Implementation Detector Constants stored in.zip file  Typically contains: Compact geometry file Set of (ascii) constants for standard algorithms  Could additionally contain: Arbitrary files (xml, ascii, binary) needed by other algorithms Other geometry formats (HepRep, LCDD) Links to database (e.g. for access to LCCD). To define a new detector just create a new.zip file.

org.lcsim Conditions Database: Implementation org.lcsim locates file based on detector name by:  Looking in alias.properties file in User’s home directory Built-in to org.lcsim software On website*  If translated name is a URL (file:, ftp:, http) Read.zip file at specified location  Search for.zip file in ~/.lcsim/detectors Built-in to org.lcsim software In  *Downloaded files are cached locally for future use

org.lcsim Conditions Database: Accessing constants Later on if constants change, listener will be called Constants are accessed by name (actually path in zip file)

Geometry Access Geometry Access is build on top of conditions database  Framework reads and decodes compact geometry description. User can iterate over detectors or access detector by name or id  Provides access to detector properties (# layers etc).  “Shape” of detector  Framework builds “IDDecoder” objects for each hit collection. ID decoder unpacks ID’s in LCIO files  Provides access hit position, detector layer etc.  Can provide additional utilities, for instance list of neighboring cells in calorimeter

org.lcsim Drivers, Event Access Reconstruction and Analysis Code is written by extending Driver class.  Most code extends only a single method process(EventHeader event)  which passes in EventHeader through which all event data, conditions, and geometry is accessed. EventHeader maintains features which users liked from old hep.lcd framework, but adds compatibility with LCIO events  All LCIO data is accessible.  Arbitrary user data, either collections or single objects can be added to event.  Event can be written out Currently only objects understood by LCIO are written out  MCParticles, Hits, Clusters, Tracks, Reconstructed Particles (can include Jets, Vertices)  Maybe be able to use LCIO “GenericObjects” to write out more in future.

Reconstruction: Clustering Several Clustering Algorithms now included  Cluster Cheater uses MC information  Nearest Neighbor Clusterer  Cone Clusterer Algorithms can be run in parallel for comparison

org.lcsim: IO Can read LCIO files, stdhep files (for FastMC) Can write LCIO files

org.lcsim: JAS Plugin The org.lcsim can be used standalone, or inside JAS3. Same code can be used in both places, so easy to move back and forth  E.g. develop in IDE and run in JAS3  E.g. develop in JAS3 and run in batch JAS3 plugin adds:  Example Analysis Code  Event browser (similar to LCIOPlugin)  Easy viewing of AIDA plots  WIRED event display integration

org.lcsim: Examples

org.lcsim: Plot Viewing

Org.lcsim: WIRED event display

org.lcsim Status Physics Utilities - done  stdhep reader  3, 4-vector utilities  diagnostic generator  Jet finder, event shape utilities Conditions framework – done  Ability to read detector constants from “zip” file  To define new detector just create new zip file and place on web File is read and cached locally  Ability to read compact geometry file Driver framework – done Fast MC – done IO Framework – done Event Access – working, still being improved Event Display interface – mostly done Reconstruction  Clustering – done  Tracking – TRF - in progress, very nearly done  Vertex finding – needs port from hep.lcd  Hit digitization – needs port from hep.lcd  Swimmer, cluster analysis tools, pfa, etc. – needs port from hep.lcd

Accessing Code To use you can just download JAS3, and then use the JAS3 Plugin Manager to install the org.lcsim Plugin  lling+JAS3 To add new software to the framework check out the software from CVS and build using “maven”  ding+org.lcsim+software ding+org.lcsim+software

org.lcsim: To Do List Improve Documentation/Tutorials Continue to (work with others to) migrate reconstruction algorithms from hep.lcd  Strongly encourage people to work in CVS: If we make changes to event access etc. we can update all code in CVS using refactoring tools Remove divergences from LCIO standard  100% compatible with LCIO file format, philosophy  Attempts to make event access easier should be merged back into LCIO standard interfaces?  LCIOPlugin and org.lcsim plugin should be merged Test ability to interoperate with other software, e.g. slic, marlin, mokka, jupiter, brahms, lelaps, etc. Produce new CD, hopefully well before Snowmass meeting. Online weekly clinic using VRVS/ES net?