CMS Particle Flow and Tau Identification Results

This page is still maintained on a best-effort basis; please see the official CMS Publications page for a fully up-to-date list of results.

The contact details of the current conveners can be found here.

Publications in CDS

• Papers
• Physics Analysis Summaries with collision data
• Physics Analysis Summaries from MC studies
• Detector Performance Summaries

Results on new CMS public results page

• Tau publications
• Tau preliminary results
• Detector performance, including Tau performance

Plots and Results

Latest approved results

Particle Flow

• PRF-14-001 Particle-flow reconstruction and global event description with the CMS detector, JINST 12 (2017) P10003

Tau - Papers and Physics Analysis summaries

• TAU-18-001 An embedding technique to determine genuine $\tau\tau$ backgrounds from CMS data, CMS Physics Analysis Summary
• TAU-16-003 Performance of reconstruction and identification of $\tau$ leptons decaying to hadrons and $\nu_{\tau}$ in pp collisions at $ \sqrt{s} = $ 13 TeV, JINST 13 (2018) P10005
• TAU-16-002 Performance of reconstruction and identification of τ leptons in their decays to hadrons and ντ in LHC Run-2, CMS Physics Analysis Summary
• TAU-14-001 Reconstruction and identification of τ lepton decays to hadrons and ντ at CMS, JINST 11 (2016) P01019
• TAU-11-001 Performance of τ lepton reconstruction and identification in CMS, JINST 7 (2012) P01001

Tau - DP Notes

There is no guarantee that the following list of DP notes is complete. You can find all tau related DP notes here.

• DP-2019-041 Identification of hadronic tau decay channels using multivariate analysis (MVA decay mode)
• DP-2019-039 Performance of the low-pT tau identification algorithm
• DP-2019-033 Performance of the DeepTau algorithm for the discrimination of taus against jets, electrons, and muons
• DP-2019-012 Tau Lepton Run 2 Trigger Performance
• DP-2018-054 Tau reconstruction with calorimeter jets at sqrt(s) = 13 TeV
• DP-2018-035 2018 Tau Trigger Reconstruction Comparison
• DP-2018-026 Tau Identification Performance in 2017 Data at srt(s) = 13 TeV
• DP-2018-009 2017 Tau Trigger Efficiencies
• DP-2018-006 Level-1 tau trigger performance in 2017 data
• DP-2017-036 Jet to Tau Mis-identification with 2016 pp collision data at = 13 TeV, Detector Performance Summary
• DP-2017-035 Tau trigger commissioning on first 2017 13 TeV data
• DP-2017-031 Tau trigger performances on 2016 13 TeV data
• DP-2017-006 Performance of tau identification with 2016 data at = 13 TeV, Detector Performance Summary
• DP-2017-002 Tau-Id performance with full 2016 dataset of 36.8/fb using Z→τμτh events, Detector Performance Summary
• DP-2016-066 Expected tau identification performance in LHC run-2 at sqrt(s) = 13 TeV
• DP-2016-060 Tau-Id performance to separate tau leptons with helicity +1 and -1 using τ→a1ν→3π±ν and τ→ρν→π±π0ν decays
• DP-2016-040 Tau energy scale and μ→τ misidentification rate estimated with early 2016 data using Z events, Detector Performance Summary
• DP-2016-038 Tau identification in boosted topologies, Detector Performance Summary
• DP-2016-037 Tau trigger performances on 13 TeV data, Detector Performance Summary
• DP-2016-029 Tau trigger performances at 13 TeV with 2015 data
• DP-2016-015 Tau-Id performance with early 2016 data using Z→τμτh events, Detector Performance Summary

Trigger results

Tau trigger related results can also be found in the following TWiki pages:

• L1 Trigger DPG TWiki link,
• Trigger Studies Group (TSG) TWiki link.

Older plots

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Figure	Abbreviated Caption
	Tau Efficiency Curves Efficiency of three most-common ID algorithms vs. truth pT with respect to truth-matched taus. Computed using Ztautau simulated events
	Tau MVA Isolation Performance Marginal eciency-vs.-fake rate for cut-based vs. MVA isolation with respect to tau candidates passing the decay mode" selection. Efficiency from Ztautau  simulated events. Fake rate from multi-jet data
	Tau MVA Isolation Motivation MVA splits isolation region into rings in DeltaR. Isolation deposits in real taus are typically from leakage (low DeltaR) or pile-up/underlying-event (high DeltaR)
	Tau Energy Pileup Stability ET resolution for different bins of reconstructed vertices in Ztautau simulated events. Reconstructed tau energy is nearly independent of PU
	Tau Cut-based Efficiency Pileup Stability Cut-based ID efficiency versus number of reconstructed vertices. Efficiency is nearly at with respect to PU. Efficiency is defined with respect to truth-matched taus with visible pT > 20 GeV
	Tau MVA Efficiency Pileup Stability Efficiency-vs.-fake rate for cut-based vs. MVA isolation. Efficiency from simulated Ztautau events. Fake rate from multijet data. MVA2 is a new MVA training with improved performance for high Pt taus (not shown in the plot)
	Tau MVA Retraining Efficiency-vs.-fake rate for cut-based vs. MVA isolation. Efficiency from simulated Ztautau events. Fake rate from multijet data. MVA2 is a new MVA training with improved performance for high Pt taus (not shown in the plot)
	Tau Invariant Mass Reconstruction Reconstructed tau invariant mass, split by decay mode. In enriched Ztautau events, using the selections in the CMS Htautau search (CMS-PAS-HIG-13-004). This variable is sensitive to the reconstruction of the tau decay mode and the tau energy scale

	Efficiency to pass cut-based tau ID (HPS combined isolation 3-hit) Efficiency to pass cut-based tau ID (HPS combined isolation 3-hit), measured via Tag & probe using Z -> tautau events
	Efficiency to pass MVA tau ID that uses tau lifetime information Efficiency to pass MVA tau ID that uses tau lifetime information, measured via Tag & probe using Z -> tautau events

	Jet -> tau fake-rate in QCD mutl-jet events for cut-based tau ID (HPS combined isolation 3-hit) Jet -> tau fake-rate for cut-based tau ID (HPS combined isolation 3-hit), in QCD multi-jet events triggered by PFJet320 trigger
	Jet -> tau fake-rate in QCD multi-jet events for MVA tau ID that uses tau lifetime information Jet -> tau fake-rate for MVA tau ID that uses tau lifetime information, in QCD multi-jet events triggered by PFJet320 trigger

	Jet -> tau fake-rate vs. tau ID efficiency Jet -> tau fake-rate vs. tau ID efficiency for different tau ID discrminators (for jets in QCD multi-jet and taus in Z'(2.5 TeV) -> tautau Monte Carlo samples
	Jet -> tau fake-rate vs. tau ID efficiency Jet -> tau fake-rate vs. tau ID efficiency for different tau ID discrminators (for jets in QCD multi-jet and taus in Standard Model Z -> tautau Monte Carlo samples

Most Important Approved Plots For TAU-11-001 ( click on plot to get .pdf )

Study of tau reconstruction algorithms using pp collisions data collected at sqrt(s) = 7 TeV

Link to TAU-11-001 PAS in CDS

Figure	Abbreviated Caption
	The plot shows a fraction of generated taus of a given type reconstructed in a certain decay mode for the HPS ``loose'' working point and a sample of Z to tautau simulated MC events.
	The plot represents data to MC comparison for number of taus reconstructed in different tau decay modes using a data sample of Z to tautau to mutau events. The MC is a mixture of the signal and background MC samples based on the corresponding cross sections.
	The visible invariant mass of the mutau system for preselected events which passed the HPS ``loose'' tau identification requirements compared to predictions of the MC simulation.
	The visible invariant mass of the mutau system for preselected events which failed the HPS ``loose'' tau identification requirements compared to predictions of the MC simulation.
	The expected efficiency of the tau algorithms as a function of generated visible tau pt estimated using a sample of simulated Z tautau events for the TaNC algorithm.
	The expected efficiency of the tau algorithms as a function of generated visible tau pt estimated using a sample of simulated Z to tautau events for the HPS algorithm.
	The reconstructed invariant mass of taus decaying into one charged and one neutral pion compared to predictions of the simulation. The black lines represent results of the fit and the dashed lines represent the predictions with tau energy scale, TauES, varied up and down by 3\%.
	The reconstructed invariant mass of taus decaying into three charged pions compared to predictions of the simulation. The black lines represent results of the fit and the dashed lines represent the predictions with tau energy scale, TauES, varied up and down by 3\%.
	Probabilities of quark and gluon jets to pass ``loose'' working points of the TaNC algorithm as a function of jet pt for QCD, QCD mu-enriched and W type events. Fake-rate measured in data are represented by solid symbols and compared to MC prediction represented by open symbols.
	Probabilities of quark and gluon jets to pass ``loose'' working points of the HPS algorithm as a function of jet pt for QCD, QCD mu-enriched and W type events. Fake-rate measured in data are represented by solid symbols and compared to MC prediction represented by open symbols.
	The measured fake--rate as a function of MC estimated efficiency for all working points for QCD mu-enriched and W data samples. The PTDR points represent results of the fixed cone algorithm based on the PF taus.

Most Important Approved Plots For PFT-10-004 ( click on plot to get .pdf )

Study of tau reconstruction algorithms using pp collisions data collected at sqrt(s) = 7 TeV

Link to PFT-10-004 PAS in CDS

Figure	Abbreviated Caption
	Transverse Invariant Mass of muon + Tau in Z->TauTau events
	Measured Fake Rate of theTau identification
	Efficiency of theTau identification from Simulation

Most Important Approved Plots For PFT-10-003 ( click on plot to get .pdf )

Particle-flow commissioning with muons and electrons from J/Psi and W events at 7 TeV

Link to PFT-10-003 PAS in CDS

Figure	Abbreviated Caption
	J/Psi -> ee mass peak
	Electron-Id MVA distribution
	Distribution of Photons Around the Electrons in Simulation
	Electron + MET Transverse Invariant Mass
	J/Psi -> mumu Invatiant Mass
	Muon Particle-based Isolation
	Muon + MET Transverse Invariant Mass

Most Important Approved Plots For PFT-10-002 ( click on plot to get .pdf )

Commissioning of the Particle-Flow reconstruction in Minimum-Bias and Jet Events from pp Collisions at 7 TeV

Link to PFT-10-002 PAS in CDS

Figure	Abbreviated Caption
	Pi0 reconstructed Mass
	Calorimeter Calibration
	Calorimeter cleaning and effect on Particle-based MET
	PFSumEt in Di-Jet Events at 7 TeV
	PFMET divided by the PFSumEt in Minimum Bias Events at 7 TeV
	PFMET Resolution Vs PFSumEt in Minimum Bias Events at 7 TeV
	Corrected Particle-Flow Jet pT at 7 TeV
	Particle-Flow Jet composition at 7 TeV
	Corrected Particle-Flow Jet pT at 7 TeV

Most Important Approved Plots For PFT-09-001 ( click on plot to get .pdf )

Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET

Link to PFT-09-001 PAS in CDS

Figure	Abbreviated Caption
	Jet Response in the Simulation
	Jet Energy Resolution in the Simulation

-- SimoneGennai - 09-Aug-2010