PF Jet Performances at High Level Trigger using Patatrack pixel tracks (CMS DP-2021/005)

As the start of the LHC Run III approaches, there are substantial efforts towards accelerating the Particle Flow (PF) reconstruction at the High Trigger-Level (HLT) to allow new physics searches to probe unexplored regions of parameter space at lower masses and weaker couplings. Since Run II, the quality of pixel track reconstruction has been greatly improved, which in turn allows us to consider using these optimized pixel tracks, called "Patatrack'' pixel tracks, as inputs to the PF reconstruction algorithm at HLT, leading to significant decrease of processing time. In this note, the performance of PF jets reconstructed with "Patatrack'' pixel tracks as inputs is compared to that of PF jets reconstructed using the standard Run II tracks reconstructed at the HLT. The comparisons include PF jet energy fractions, PF particle multiplicities, as well as PF jet resolution and response.

More details can be found in the CMS-DP-2021-005 note.


timing.png PF scouting reconstruction timing
A comparison of the time it takes to reconstruct scouting objects for different track reconstruction algorithms used by the PF algorithm at the HLT. The time was measured on a “Skylake” Xeon Gold 6130 processor using 4 threads running on 2018 data events passing L1 seeds of interest to the scouting program.
[Get pdf version]
Contact: Dimitrios Karasavvas


ChargedHadronPt_LowPt_Central.png   ChargedHadronPt_LowPt_Forward.png Charged Hadron pT
A comparison of the transverse momentum of charged hadrons clustered into PF jets for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 30-100 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedHadronPt_MiddlePt_Central.png   ChargedHadronPt_MiddlePt_Forward.png Charged Hadron pT
A comparison of the transverse momentum of charged hadrons clustered into PF jets for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 100-400 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedHadronPt_HighPt_Central.png   ChargedHadronPt_HighPt_Forward.png Charged Hadron pT
A comparison of the transverse momentum of charged hadrons clustered into PF jets for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 400-1000 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedHadronFraction_Central_LowPt.png   ChargedHadronFraction_Forward_LowPt.png Charged Hadron Energy Fraction
A comparison of the energy fraction carried by charged hadrons of a PF jet for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 30-100 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedHadronFraction_Central_MiddlePt.png   ChargedHadronFraction_Forward_MiddlePt.png Charged Hadron Energy Fraction
A comparison of the energy fraction carried by charged hadrons of a PF jet for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 100-400 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedHadronFraction_Central_HighPt.png   ChargedHadronFraction_Forward_HighPt.png Charged Hadron Energy Fraction
A comparison of the energy fraction carried by charged hadrons of a PF jet for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 400-1000 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedMultiplicity_Central_LowPt.png   ChargedMultiplicity_Forward_LowPt.png Charged Multiplicity
A comparison of the multiplicity of charged particles comprising the PF jets for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 30-100 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedMultiplicity_Central_MiddlePt.png   ChargedMultiplicity_Forward_MiddlePt.png Charged Multiplicity
A comparison of the multiplicity of charged particles comprising the PF jets for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 100-400 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


ChargedMultiplicity_Central_HighPt.png   ChargedMultiplicity_Forward_HighPt.png Charged Multiplicity
A comparison of the multiplicity of charged particles comprising the PF jets for different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown. The comparisons are performed for jets with (left) and (right), and transverse momentum 400-1000 GeV.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


MET.png Missing transverse energy
A comparison of missing energy in events for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for events whose PF candidates were reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown.
[Get pdf version]
Contact: Dimitrios Karasavvas


METovSumEt.png Missing transverse energy / Scalar sum of jet pT
A comparison of missing energy divided by the scalar sum of all the jet transverse momenta in event for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for events whose PF candidates were reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown.
[Get pdf version]
Contact: Dimitrios Karasavvas


pTresponse_test_Central.png   pTresponse_test_Forward.png Preliminary jet pT response
The jet response is the mean of a Gaussian fit in the core of the raw distribution of PF jets in several and bins. A comparison of the jet response of PF jets with (left) and (right) for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas


pTresolution_test_Central.png   pTresolution_test_Forward.png Preliminary jet pT resolution
The jet resolution is the sigma of a Gaussian fit in the core of the raw distribution of PF jets in several and bins, after correcting the reconstructed jet by the response. A comparison of the jet resolution of PF jets with (left) and (right) for the different track reconstructions used by the PF algorithm at HLT. The normalized distributions for PF candidates reconstructed using Run2 tracking (black), patatrack pixel tracks with the tight selection (blue) and patatrack pixel tracks with the loose selection (red) are shown.
[Get pdf version left] [Get pdf version right]
Contact: Dimitrios Karasavvas

-- LisaBenato - 2021-04-07

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf ChargedHadronFraction_Central_HighPt.pdf r1 manage 15.8 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Central_HighPt.png r1 manage 30.9 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronFraction_Central_LowPt.pdf r1 manage 15.4 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Central_LowPt.png r1 manage 29.2 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronFraction_Central_MiddlePt.pdf r1 manage 15.8 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Central_MiddlePt.png r1 manage 30.5 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronFraction_Forward_HighPt.pdf r1 manage 15.8 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Forward_HighPt.png r1 manage 31.3 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronFraction_Forward_LowPt.pdf r1 manage 15.6 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Forward_LowPt.png r1 manage 30.0 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronFraction_Forward_MiddlePt.pdf r1 manage 15.8 K 2021-04-09 - 17:21 LisaBenato  
PNGpng ChargedHadronFraction_Forward_MiddlePt.png r1 manage 30.7 K 2021-04-09 - 17:21 LisaBenato  
PDFpdf ChargedHadronPt_HighPt_Central.pdf r1 manage 15.2 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_HighPt_Central.png r1 manage 27.8 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedHadronPt_HighPt_Forward.pdf r1 manage 15.0 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_HighPt_Forward.png r1 manage 27.7 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedHadronPt_LowPt_Central.pdf r1 manage 15.2 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_LowPt_Central.png r1 manage 27.9 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedHadronPt_LowPt_Forward.pdf r1 manage 15.2 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_LowPt_Forward.png r1 manage 28.0 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedHadronPt_MiddlePt_Central.pdf r1 manage 15.5 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_MiddlePt_Central.png r1 manage 28.6 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedHadronPt_MiddlePt_Forward.pdf r1 manage 15.4 K 2021-04-09 - 17:05 LisaBenato  
PNGpng ChargedHadronPt_MiddlePt_Forward.png r1 manage 28.5 K 2021-04-09 - 17:06 LisaBenato  
PDFpdf ChargedMultiplicity_Central_HighPt.pdf r1 manage 15.3 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Central_HighPt.png r1 manage 28.3 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf ChargedMultiplicity_Central_LowPt.pdf r1 manage 15.1 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Central_LowPt.png r1 manage 27.9 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf ChargedMultiplicity_Central_MiddlePt.pdf r1 manage 15.1 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Central_MiddlePt.png r1 manage 28.0 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf ChargedMultiplicity_Forward_HighPt.pdf r1 manage 15.3 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Forward_HighPt.png r1 manage 28.7 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf ChargedMultiplicity_Forward_LowPt.pdf r1 manage 15.2 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Forward_LowPt.png r1 manage 27.9 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf ChargedMultiplicity_Forward_MiddlePt.pdf r1 manage 15.3 K 2021-04-09 - 17:57 LisaBenato  
PNGpng ChargedMultiplicity_Forward_MiddlePt.png r1 manage 28.1 K 2021-04-09 - 17:57 LisaBenato  
PDFpdf MET.pdf r1 manage 15.0 K 2021-04-09 - 18:04 LisaBenato  
PNGpng MET.png r1 manage 25.2 K 2021-04-09 - 18:04 LisaBenato  
PDFpdf METovSumEt.pdf r1 manage 15.0 K 2021-04-09 - 18:04 LisaBenato  
PNGpng METovSumEt.png r1 manage 24.0 K 2021-04-09 - 18:04 LisaBenato  
PDFpdf pTresolution_test_Central.pdf r1 manage 16.3 K 2021-04-09 - 18:11 LisaBenato  
PNGpng pTresolution_test_Central.png r1 manage 29.6 K 2021-04-09 - 18:11 LisaBenato  
PDFpdf pTresolution_test_Forward.pdf r1 manage 16.8 K 2021-04-09 - 18:11 LisaBenato  
PNGpng pTresolution_test_Forward.png r1 manage 29.9 K 2021-04-09 - 18:11 LisaBenato  
PDFpdf pTresponse_test_Central.pdf r1 manage 16.0 K 2021-04-09 - 18:11 LisaBenato  
PNGpng pTresponse_test_Central.png r1 manage 28.1 K 2021-04-09 - 18:11 LisaBenato  
PDFpdf pTresponse_test_Forward.pdf r1 manage 15.9 K 2021-04-09 - 18:11 LisaBenato  
PNGpng pTresponse_test_Forward.png r1 manage 28.1 K 2021-04-09 - 18:11 LisaBenato  
PDFpdf timing.pdf r1 manage 24.1 K 2021-04-09 - 16:58 LisaBenato  
PNGpng timing.png r1 manage 65.4 K 2021-04-09 - 16:58 LisaBenato  
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