Useful links & general information

Useful twikis

General presentations

List of tasks for the TTI working group

Simulation basics, clusters, stubs, tracklets, L1 tracks

Mostly the responsibility of the Track Trigger group of the Tracker DPG.

  • Clarify the HL-LHC parameters
  • Establish gemetries and material descriptions for both LB and Barrel+Endcap.
  • Establish persistent L1 tracks class. ( largely done ?)
  • Algorithm from LB that fills L1 tracks. (Largely done.)
  • Algorithm from Barrel-Endcap that fills L1 tracks
  • Tool that generates L1 tracks from MC truth by parameterizing resolution, backgrounds, efficiency.
  • Tools/package that generates performance plot of tracking algorithm. This should include:
    • Efficiencies and rates (separated by 'true' objects and fakes) for simhits, digis, clusters, stubs, tracklets.
    • Single track efficiency as function of pt and eta for e, mu, pi, K, and protons.
    • Efficiency for same set of particles in a jet environment.
  • For L1 trigger (e, mu, jets) we need to make sure that we have the upgraded L1 trigger simulation in the same release as we have the track triggers code. Is this an issue? Suchandra and Student started to look at this.

Issues common to electrons and muons

  • Can we have a common track to e/mu mathing tools?
  • Can we have common tracker based isolation algorithm?

Electrons & Photons

  • Reproduce all studies done on the electron+stubs matching algorithm documented in DN-12-003. Including sources of fakes. Verify/reoptimize the matching windows used.
  • Repeat for Barrel+Endcap.
  • For electrons match tracks to L1 electrons. Compare to stub based algorithm as implemented by Laura Fields, now Atanu M. What is the effective E/p cut in this algorithm?
  • isolation w.r.t. tracks
  • Understand limitation from calorimeter resolutions (0.043x0.043)
  • Need to develop standard performance plots.
  • Look at electron algorithms with pixels.
  • Is there any way to do tracker based isolation for photons?
  • What about cluster shape? With higher resolution (crystal level info?) - more an issue for the L1Cal


  • For the DT algorithm (stubs). Get rates and efficiences as function of eta. Understand limitations from muon resolution.
  • Match muons to L1 tracks.
  • isolation w.r.t. tracks
  • Perform similar algorithms for the forward muons.
  • Standard performance plots.


  • Look at isolation for taus using tracks and z-vertex information. I.e. update the studies of Nicola P. use both LB and Barrel+Endcap.
  • Can you find the tau vertex?
  • What is the performance as fcn of pt cutoff on L1 tracks.
  • Get guidance from the HLT algorithms.
  • Standard performance plots.

Vertexing / jet matching

  • Develop algorithm that determines z-vertex of jet. How often can we get the vertex? How useful is this in reducing the L1 rate for multijet triggers.
  • What can we do with (regional) pixel information.

Monte-Carlo production

  • What MC samples do we need to produce?
  • What shape is reco in? Can we use reco for upgraded tracker, or should we 'forget' about this for now?
  • Plan big production. Prepare for ~Feb. Try to do smaller samples earlier.
  • Need to define benchmark samples by ~Jan. interact with upgrade physics.

Global tasks / issues

  • L1 menu (How much of this is actually our job?). Need a contact person in the L1 Upgrade task force
  • Establish efficiency and rejection for selection of electrons, muons, taus, jets. Study the sensitivity to tracking resolution.
  • Misalignment and sensitivity to triggering.


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Topic revision: r2 - 2012-11-14 - EmmanuellePerez
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