Performance of Run-3 HLT Track Reconstruction

(CMS DP-2022/014)

This note reports on track and vertex reconstruction in the context of HLT at LHC Run-3.

Metrics definitions

Tracking

  • A reconstructed track is considered associated to a simulated particle if more than 75% of its hits have been originated from this simulated particle. If this is not the case, the reconstructed track is considered as a random combination of hits and marked as a misidentified (fake) track.

  • The tracking efficiency is defined as the fraction of simulated tracks associated to at least one reconstructed track. Only simulated tracks coming from the signal (hard scattering) vertex are used in the efficiency computation.

  • The tracking fake rate is defined as the fraction of misidentified reconstructed tracks. All simulated tracks coming from any vertex (including pileup vertices) are used in the fake rate computation.

Vertexing
  • Reconstructed pixel vertices are considered matched to a simulated vertex if the following conditions are satisfied:

    • |Δz|<1 mm;

    • |Δz|/σz < 3, where σz is the uncertainty in the reconstructed vertex z position.

  • Reconstructed vertices that are not matched to a simulated vertex are counted as misidentified (fake).

More details can be found in the DP-2022/014 note (CDS record: CMS-DP-2022-014).

Results

run2_run3_efficPt.png

Tracking Efficiency vs pt.png[ Get pdf version]

  • The tracking efficiency is shown as a function of the simulated track pt.png for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

  • Only simulated tracks with pt_gt_0p4.png GeV and pseudorapidity eta_lt_3.png are considered in the efficiency measurement.

  • The reduction of efficiency at large track pt.png is characteristic of the sample used for the efficiency measurement. This effect is caused by the presence of a large number of tracks in the core of high pt.png jets.

Contact: Adriano Di Florio
run2_run3_effic.png

Tracking Efficiency vs η [ Get pdf version]

  • The tracking efficiency is shown as a function of the simulated track pseudorapidity η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

  • Only simulated tracks with pt_gt_0p9.png GeV and eta_lt_3.png are considered in the efficiency measurement.

Contact: Adriano Di Florio

run2_run3_effic_vs_phi.png

Tracking Efficiency vs ɸ [ Get pdf version]

  • The tracking efficiency is shown as a function of the simulated track azimuthal angle ɸ for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

  • Only simulated tracks with pt_gt_0p9.png GeV and eta_lt_3.png are considered in the efficiency measurement.

Contact: Adriano Di Florio

run2_run3_effic_vs_pu.png

Tracking Efficiency vs PU [ Get pdf version]

  • The tracking efficiency is shown as a function of the event pileup (PU) for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

  • Only simulated tracks with pt_gt_0p9.png GeV and eta_lt_3.png are considered in the efficiency measurement.

Contact: Adriano Di Florio

run2_run3_fakeratePt.png

Tracking Fake Rate vs pt.png [ Get pdf version]

  • The tracking fake rate is shown as a function of the reconstructed track pt.png for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).
  • In the Run-3 HLT tracking, unlike Run-2, no track is reconstructed with pt_sim_0p3.png GeV. As a consequence, the total amount of fake tracks reconstructed in the Run-2 HLT tracking is sensibly larger with respect to Run-3.

Contact: Adriano Di Florio

run2_run3_fakerate.png

Tracking Fake Rate vs η [ Get pdf version]

  • The tracking fake rate is shown as a function of the reconstructed track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

  • The fake rate is sensibly smaller for the Run-3 HLT tracking in the region with eta_interval.png, i.e., around the transition region between the barrel and the endcap detectors. In Run-3, pixel triplets are used to seed the track reconstruction in the full detector volume. For the Run-2 HLT tracking, pixel triplets are used to seed the Run-2 iter2 only in regions around jet candidates identified from calorimeter information and from the tracks reconstructed in the two previous iterations. This allows for a better performance in the transition region for Run-3.

Contact: Adriano Di Florio

run2_run3_fakerate_vs_phi.png

Tracking Fake Rate vs ɸ [ Get pdf version]

  • The tracking fake rate is shown as a function of the reconstructed track ɸ for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_fakerate_vs_pu.png

Tracking Fake Rate vs PU [ Get pdf version]

  • The tracking fake rate is shown as a function of the event pileup (PU) for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_cotThetares_vs_eta_Sigma.png

Track cot(θ) Resolution vs η [ Get pdf version]

  • The track cot(θ) resolution is shown as a function of the simulated track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_dxyres_vs_eta_Sigma.png

Track dxy.png Resolution vs η [ Get pdf version]

  • The track dxy.png resolution is shown as a function of the simulated track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_dzres_vs_eta_Sigma.png

Track dz.png Resolution vs η [ Get pdf version]

  • The track dz.png resolution is shown as a function of the simulated track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_phires_vs_eta_Sigma.png

Track ɸ Resolution vs η [ Get pdf version]

  • The track ɸ resolution is shown as a function of the simulated track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_ptres_vs_eta_Sigma.png

Track pt.png Resolution vs η [ Get pdf version]

  • The track pt.png resolution is shown as a function of the simulated track η for the Run-2 HLT tracking (blue) and the Run-3 HLT single-iteration tracking (red).

Contact: Adriano Di Florio

run2_run3_pixel_seeding_effic.png

Pixel Tracking Efficiency vs η [ Get pdf version]

  • The pixel tracking efficiency is shown as a function of the simulated track η for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • Only simulated tracks with pt_gt_0p9.png GeV and eta_lt_3.png are considered in the efficiency measurement.

Contact: Adriano Di Florio

run2_run3_pixel_seeding_efficPt.png

Pixel Tracking Efficiency vs pt.png [ Get pdf version]

  • The pixel tracking efficiency is shown as a function of the simulated track pt.png for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • Only simulated tracks with pt_gt_0p4.png GeV and eta_lt_3.png are considered in the efficiency measurement.

  • The reduction of efficiency at large track pt.png is characteristic of the sample used for the efficiency measurement, and is due to combinatorial effects in nonisolated event topologies.

Contact: Adriano Di Florio

run2_run3_pixel_seeding_effic_vs_phi.png

Pixel Tracking Efficiency vs ɸ [ Get pdf version]

  • The pixel tracking efficiency is shown as a function of the simulated track ɸ for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • Only simulated tracks with pt_gt_0p9.png GeV and eta_lt_3.png are considered in the efficiency measurement.

Contact: Adriano Di Florio

run2_run3_pixel_seeding_fakerate.png

Pixel Tracking Fake Rate vs η [ Get pdf version]

  • The pixel tracking fake rate is shown as a function of the reconstructed track η for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • For Run-3 HLT pixel tracks, the larger fake rate with respect to Run-2 arises from the large combinatorics due to the reconstruction of pixel tracks from only three pixel hits in the full detector volume.

Contact: Adriano Di Florio

run2_run3_pixel_seeding_fakeratePt.png

Pixel Tracking Fake Rate vs pt.png [ Get pdf version]

  • The pixel tracking fake rate is shown as a function of the reconstructed track pt.png for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • For Run-3 HLT pixel tracks, the larger fake rate with respect to Run-2 arises from the large combinatorics due to the reconstruction of pixel tracks from only three pixel hits in the full detector volume.

  • The majority of the misidentified pixel tracks are discarded by the downstream track building steps and thus they donít affect the fake rate for full (i.e. not pixel-only) tracks.

Contact: Adriano Di Florio

run2_run3_pixel_seeding_fakerate_vs_phi.png

Pixel Tracking Fake Rate vs ɸ [ Get pdf version]

  • The pixel tracking fake rate is shown as a function of the reconstructed track ɸ for the Run-2 HLT pixel tracks (stacked histogram) and the Run-3 HLT pixel tracks (red).

  • In the stacked filled histogram, the contributions from three Run-2 HLT pixel track collections are stacked:

    • Run-2 HLT iter0 pixel tracks (light blue);

    • Run-2 HLT iter1 pixel tracks (deep purple);

    • Run-2 HLT iter2 pixel tracks (violet).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

  • For Run-3 HLT pixel tracks, the larger fake rate with respect to Run-2 arises from the large combinatorics due to the reconstruction of pixel tracks from only three pixel hits in the full detector volume.

Contact: Adriano Di Florio

run2_run3_pixel_cotThetares_vs_eta_Sigma.png

Pixel Track cot(θ) Resolution vs η [ Get pdf version]

  • The pixel track cot(θ) resolution is shown as a function of the simulated track η for Run-2 HLT (iter0+iter1+iter2) pixel tracks (blue) and Run-3 Patatrack pixel tracks (red).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

Contact: Adriano Di Florio

run2_run3_pixel_dxyres_vs_eta_Sigma.png

Pixel Track dxy.png Resolution vs η [ Get pdf version]

  • The pixel track dxy.png resolution is shown as a function of the simulated track η for Run-2 HLT (iter0+iter1+iter2) pixel tracks (blue) and Run-3 Patatrack pixel tracks (red).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

Contact: Adriano Di Florio

run2_run3_pixel_dzres_vs_eta_Sigma.png

Pixel Track dz.png Resolution vs η [ Get pdf version]

  • The pixel track dz.png resolution is shown as a function of the simulated track η for Run-2 HLT (iter0+iter1+iter2) pixel tracks (blue) and Run-3 Patatrack pixel tracks (red).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

Contact: Adriano Di Florio

run2_run3_pixel_phires_vs_eta_Sigma.png

Pixel Track ɸ Resolution vs η [ Get pdf version]

  • The pixel track ɸ resolution is shown as a function of the simulated track η for Run-2 HLT (iter0+iter1+iter2) pixel tracks (blue) and Run-3 Patatrack pixel tracks (red).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

Contact: Adriano Di Florio

run2_run3_pixel_ptres_vs_eta_Sigma.png

Pixel Track pt.png Resolution vs η [ Get pdf version]

  • The pixel track pt.png resolution is shown as a function of the simulated track η for Run-2 HLT (iter0+iter1+iter2) pixel tracks (blue) and Run-3 Patatrack pixel tracks (red).

  • For each collection, only the pixel tracks selected to be used as seeds for the full track reconstruction are considered.

Contact: Adriano Di Florio

run2_run3_pixel_effic_vs_NumVertices.png

Pixel Vertices Efficiency vs PU [ Get pdf version]

  • The pixel vertex efficiency is shown as a function of the number of simulated vertices for the Run-2 HLT (blue) and the Run-3 HLT (red) vertex reconstruction algorithms.

Contact: Adriano Di Florio

run2_run3_pixel_fakerate_vs_PU.png

Pixel Vertices Fake Rate vs PU [ Get pdf version]

  • The pixel vertex fake rate is shown as a function of the number of simulated vertices for the Run-2 HLT (blue) and the Run-3 HLT (red) vertex reconstruction algorithms.

Contact: Adriano Di Florio

run2_run3_pixel_MatchedRecoVtx_vs_GenVtx.png

Pixel Vertices Reconstructed vs Simulated [ Get pdf version]

  • The number of reconstructed pixel vertices matched to a simulated one is shown as a function of the number of simulated vertices for the Run-2 HLT (blue) and the Run-3 HLT (red) vertex reconstruction algorithms.

Contact: Adriano Di Florio

Topic attachments
I Attachment History Action Size Date Who Comment
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PNGpng run2_run3_pixel_seeding_fakeratePt.png r1 manage 312.3 K 2022-05-16 - 12:25 AdrianoDiFlorio Pixel Tracks Fake Rate
Unknown file formateps run2_run3_pixel_seeding_fakerate_vs_phi.eps r1 manage 1976.7 K 2022-05-16 - 12:25 AdrianoDiFlorio Pixel Tracks Fake Rate
PDFpdf run2_run3_pixel_seeding_fakerate_vs_phi.pdf r1 manage 42.7 K 2022-05-16 - 12:25 AdrianoDiFlorio Pixel Tracks Fake Rate
PNGpng run2_run3_pixel_seeding_fakerate_vs_phi.png r1 manage 251.7 K 2022-05-16 - 12:25 AdrianoDiFlorio Pixel Tracks Fake Rate
Unknown file formateps run2_run3_ptres_vs_eta_Sigma.eps r1 manage 1977.1 K 2022-05-16 - 12:31 AdrianoDiFlorio Track Resolutions II
PDFpdf run2_run3_ptres_vs_eta_Sigma.pdf r1 manage 61.5 K 2022-05-16 - 12:30 AdrianoDiFlorio Track Resolutions
PNGpng run2_run3_ptres_vs_eta_Sigma.png r1 manage 302.3 K 2022-05-16 - 12:32 AdrianoDiFlorio Track Resolutions II
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Topic revision: r8 - 2023-03-16 - AdrianoDiFlorio
 
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