Silicon detector design study tracking analysis program for the international linear collider
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Silicon Detector Design Study Tracking Analysis Program for the International Linear Collider. Pelham Keahey Richard Partridge SULI 2008. International Linear Collider (ILC). Graphic courtesy of ILC / form one visual communication. SiD Detector Concept Design.

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Silicon detector design study tracking analysis program for the international linear collider
Silicon Detector Design Study Tracking Analysis Program for the International Linear Collider

Pelham Keahey

Richard Partridge

SULI 2008


International linear collider ilc
International Linear Collider (ILC) the International Linear Collider

Graphic courtesy of ILC / form one visual communication


Sid detector concept design
SiD the International Linear Collider Detector Concept Design

Graphic courtesy of Norman Graf, SLAC/Sandbox Studio


Analysis program objectives
Analysis Program Objectives the International Linear Collider

  • Develop a program(s) to:

  • Display and analyze pull distributions of five helix parameters

  • Track purity and the fake track rate

  • Track finding Efficiency


Helix parameters
Helix Parameters the International Linear Collider

  • ω - curvature of the track

  • δ -distance of closest approach (dca)

  • Ф0 -azimuthmal angle of the momentum at the dca

  • tan λ-dz/ds, slope in the sz plane

  • z0 -z position at the dca


Helix parameter calculations
Helix Parameter Calculations the International Linear Collider

  • ω

  • δ

    xc= x + R sin f

    yc= y - R cosf

    δ = R - (xc2+ yc2)1/2

  • Ф0

  • tan λ

    tan λ =pz / (px2 + py2)1/2

  • z0

    z = z0 + s tanl


Pull distributions
Pull Distributions the International Linear Collider

  • Error is different per fitted helix (track)

    • Tracks will go through different part of the detector

    • Multiple scattering

    • How many hits


Z 0 pull distribution
Z the International Linear Collider0 Pull Distribution


Purity faketrack rate
Purity— the International Linear ColliderFakeTrack Rate

  • Purity is taking the hits used to create a track and determining how many of those hits are actually from the MCParticle’s path being fitted

  • For the Z0 events the tracking program produced no fake tracks. Fake Tracks are defined as having a purity less than 0.5


1 purity vs hits
(1-Purity) the International Linear Collidervs Hits


Efficiency
Efficiency the International Linear Collider

  • Efficiency is calculated by taking the number of found tracks divided by the number of tracks that could have been found

  • The simulation is currently setup to ignore certain particles

  • Pt<1.1 GeV (particle that doesn’t enter the calorimeter)

  • Also if z0 > 9 mm and a δ > 9 mm

  • 7 hits minimum


Efficiency vs theta
Efficiency the International Linear Collidervs Theta


Efficiency vs p t
Efficiency the International Linear Collidervs Pt


Wire view one rho z event 130
Wire View One (Rho-z) the International Linear Colliderevent # 130


Wire view two xy event 130
Wire View Two ( the International Linear Colliderxy) event # 130


Results
Results the International Linear Collider

  • Purity: Tracks can be expected to be pure around 96.4+-0.2% of the time, depending on event.

  • In the Z0 we found no tracks below the 0.5 purity margin.

  • Efficiency: During the same event 98.6±0.1% of the findable tracks were found.


Future work
Future Work the International Linear Collider

  • As the detector evolves, different designs can be tested

  • Different and more complicated events can be run


Acknowledgements
Acknowledgements the International Linear Collider

  • Advisor: Richard Partridge

  • life saving help: CosminDeaconu

  • Everyone at SLAC

  • DOE


References
References the International Linear Collider

J. Alcaraz, Helicoidal tracks. L3 Internal Note 1666, February 18, 1995.

Internation Linear Collider website. http://www.linearcollider.org/cms/