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Root at the LCD. 6/13/2001 M. Iwasaki Univ. of Oregon. North American Linear Collider Detector Group (LCD) has constructed a simulation facility based on Root  LCD Root. So far we only support Linux and SunOS (developing Windows). Event generation at LCD Root.

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Root at the lcd

Root at the LCD

6/13/2001

M. Iwasaki Univ. of Oregon


Root at the lcd

North American Linear Collider Detector Group (LCD)

has constructed a simulation facility based on Root

 LCD Root

So far we only support Linux and SunOS (developing Windows)


Root at the lcd

Event generation at LCD Root

  • PANDORA-PYTHIA (C++) by M.Peskin

  •  our main generator

  • include beam polarization, beamstrahlung

  • CINT implementation

  • directly use in C++ interpreter

  • PYTHIA (TPYTHIA: supported by ROOT)

  • Output : ROOT or stdHEP (HEPEVT common)

  • ROOT can go through FastMC

  • stdHEP can go through FullMC (GISMO) & FastMC

  • Or can be directly linked to FastMC


Root at the lcd

Detector Simulation at LCD Root

  • We use 2 kinds of detector simulations

  • Fast simulation For physics studies

  • Full simulation For detector studies

  • Fast simulation

  • Smear particle position/energy and IP position

  • Output Root or is directly linked to Event Analysis

  • Full simulation (GISMO)

  • make digitized detector outputs (SIO binary)

  • Full recon

  • make tracks and clusters

  • Output Root or is directly linked to Event Analysis


Root at the lcd

Detector Simulation at LCD Root

HAD

Coil

HAD

EM

Coil

EM

LCD Group considering 3 kinds of Detector designs

Silicon, Large, and Precise

 Different Detector sizes, materials, and

Calorimeter Configurations….

… We prepare 3 kinds of

Detector geometry files

Detector resolution files (for smearing)

Some/all of these parameters can also be changed

at user analysis level

OR


Root at the lcd

Event Analysis at LCD Root

We have several useful analysis tools for

Linear Collider experiments

  • Jet Finder … 3 kinds of algorithms

  • Thrust Finder

  • Particle extrapolator

  • Topological Vertexing

  • … translated from SLD ZVTOP


Root at the lcd

Jet Finder

3 kinds of algorithms .. Jade, Jade E, and Durham

Comparison of original Fortran Jet Finder and ours

Fortran

LCD Root (C++)

# of Jets

# of Jets

(tt 6jets event)

Works well!


Root at the lcd

Thrust Finder

tt events

ttevents

Works well!


Root at the lcd

Topological vertex finder

Translated from SLD ZVTOP

Reconstruct secondary vertices in a jet

.. Find points of high overlap tracks

bBD

cD

D

D

B

primary

primary


Root at the lcd

Using the reconstructed vertices, we can do

1) Heavy-flavor tagging

2) Charge separation

Vertex Mass

Vertex Charge

For example..


Root at the lcd

Analysis example with b-tag:

Reconstruction of t-quark mass in tt 6jets event

Without b-tag

With b-tag

Signal

BG

Mass (GeV/c2)

Mass (GeV/c2)

(FastMC)


Root at the lcd

LCD Root Event Display

FastMC (e+e- ZH)


Root at the lcd

LCD Root Event Display

FullMC (e+e- tt)


Root at the lcd

Event structure at LCD Root

Event

Event Header event number …

Beam parameters polarization, IP position …

Generator level particle information McParticles

Raw data (Full) VXDHits TrackerHits CalHits

Reconstructed Data Tracks Clusters

Based on TClonesArray


Root at the lcd

  • Summary

  • LCD group has constructed simulation/analysis tools

  • for the future Linear Collider experiments

  • The simulation/analysis tools based on ROOT

  •  work well!

  • LCD Root handles several I/O

  • … Some of them require STL

  • (can be worked ROOT V3.00 or later)

  • There is a LCD Root tutorial page! (Under construction)

  • URL:

  • http://www-sldnt.slac.stanford.edu/nld/New/Docs

  • /LCD_Root/root.htm


Root at the lcd

  • Future Plan

  • GEANT4

  • GUI

  • Support Windows

  • We are happy to collaborate with

  • other exp. groups to develop analysis tools!!

  • ( Currently LCD Root is maintained by 2 people … )


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