Sim/Reco Meeting, April 2009Dmitry Onoprienko

SiD Sim/Reco Meeting, April 14 2009

Dmitry OnoprienkoKansas State University

Status of

ITC / CAT

related packages

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Integrated Tracking-Clustering package - Goals

Evolved from the original Calorimeter Assisted Tracking package

• Calorimeter-seeded track finder (essential for Vs, kinked tracks, etc.)

• Aid “standard” track finder

• Track – cluster association

• High purity initial clustering with topological linking starting point for PFA

Modular, flexible, easily extendable

Designed to be configured for a particular use scenario

Sim/Reco Meeting, April 2009Dmitry Onoprienko

For each Rosary :

• Propagate trajectory to the next layer

• Try to attach Dot (may branch)

• If unsuccessful, try to attach Bead

• If unsuccessful,

• If this is a single Dot Rosary with no attached track, try to attach Dot based on proximity

• Otherwise, attach Crack

• Check for Rosary termination condition

• If first termination, reverse direction

• If not terminated, update trajectory

• Run “standard” track finder

• Cluster hits in each calorimeter layer into Dots (MIP trace) and Beads

• Seed first Rosaries from tracks

• Thread created Rosaries

• For each Calorimeter Layer :

• Create new Rosaries from unattached Dots

• Thread created Rosaries

• Assign quality ratings to Rosaries, cut

• Remove duplicate parts

ITC – Basic algorithm

If entering tracker, and no track is attached to this Rosary• Create track seed

• Extend into tracker, picking up hits new track(s)

• See if there is orphan track nearby – if yes, try to stitch.

Rosary – chain of clusters, possibly with a track attached on one end.

Sim/Reco Meeting, April 2009Dmitry Onoprienko

KS0 reconstruction efficiency using ITC

Looking only at KS0 that

decayed in sensitive volume.

Very significant improvement, but…

• not a releasable quality code

• still using ancient fitter

Working on this since LOI submission

Sim/Reco Meeting, April 2009Dmitry Onoprienko

New ITC interface to geometry / propagation

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Fitter and integration issues

Rob’s fitter is not yet available.

Several possible approaches to integration with Rich’s seedtracker code :

• Use Rich’s fitter with CAT track finder

- difficult

• Use seedtracker with CAT seeds playing the confirmation layer role

- promising

- prototype version is working

- prompted some re-factoring in the ITC package

• Use CAT seeds with seedtracker finder

- probably possible, but not without significant changes to seedtracker

Need to use RosaryClusterer in several distinct modes with different goals

did some refactoring.

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Re-factored org.lcsim.contrib.crux.itc

More algorithms are available now – can be mixed-and-matched by drivers

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Status of customized RosaryClusterer versions

BasicITC – full tracking and clustering

Functional, not optimized, many obvious improvements possible

MipStubFinder – full processing of track-seeded Rosaries, then only looks for MIP stubs that can be converted into tracking seeds.

Functional, improvements possible

SeedTrackerConfirm – designed to create CAT seeds to be used in place of the confirmation layer in seedtracker

At the moment, similar to MipStubFinder. Needs to be optimized.

PlanFinish & tune SeedTrackerConfirm – based scenario code. Commit a complete example driver.

Finish & release MipStubFinder - based scenario code (Rob’s fitter ? Something else ?).

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Utility packages…

Sim/Reco Meeting, April 2009Dmitry Onoprienko

org.lcsim.contrib.onoprien.util.job

Sim/Reco Meeting, April 2009Dmitry Onoprienko

org.lcsim.contrib.onoprien.util.swim

Sim/Reco Meeting, April 2009Dmitry Onoprienko

org.lcsim.contrib.onoprien.util.swim

Sim/Reco Meeting, April 2009Dmitry Onoprienko

org.lcsim.contrib.onoprien.util.vector

Immutable implementation of Hep3Vector

Hep3Vector implementation with in-place vector operations

Sim/Reco Meeting, April 2009Dmitry Onoprienko

Others…

• Collections (org.lcsim.contrib.onoprien.util)

• Units & constants (org.lcsim.contrib.onoprien.util.constants)

• HepRep converters

• MC Truth access (org.lcsim.contrib.onoprien.crux.mctruth)

• Reconstruction performance analysis package (org.lcsim.contrib.onoprien.crux.analysis)