Silicon detector design study tracking analysis program for the international linear collider
Sponsored Links
This presentation is the property of its rightful owner.
1 / 19

Silicon Detector Design Study Tracking Analysis Program for the International Linear Collider PowerPoint PPT Presentation


  • 94 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Silicon Detector Design Study Tracking Analysis Program for the International Linear Collider

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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

Graphic courtesy of Norman Graf, SLAC/Sandbox Studio


Analysis Program Objectives

  • 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

  • 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

  • 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

  • Error is different per fitted helix (track)

    • Tracks will go through different part of the detector

    • Multiple scattering

    • How many hits


Z0 Pull Distribution


Purity—FakeTrack 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


Efficiency

  • 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 vs Pt


Wire View One (Rho-z) event # 130


Wire View Two (xy) event # 130


Results

  • 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

  • As the detector evolves, different designs can be tested

  • Different and more complicated events can be run


Acknowledgements

  • Advisor: Richard Partridge

  • life saving help: CosminDeaconu

  • Everyone at SLAC

  • DOE


References

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

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


  • Login