Difference: TauPublicResults (1 vs. 25)

Revision 252019-05-22 - GianlucaPicco

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Hadronic Tau Performance

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  Select the desired keywords to filter the results.
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Global Selections
CM Energy
Performance selections
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Date :   Filter by date:

Filtered results: [Papers Confnotes Pubnotes ]



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Global Selections
CM Energy
B Physics and Light States
Heavy Ion
SM
Top
Higgs
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HDBS
SUSY
Exotics
Physics Modelling
Tracking
Egamma
Muon
Tau
Jet/Etmiss
Flavour tagging
BSM Searches
(SUSY, HDBS, Exotics)




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Upgrade Studies
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Quick links: Papers Confnotes Pubnotes

Papers and publications
(Full list of ATLAS papers, List/RSS from CDS) Hide table

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Short Title Group Journal Reference Date √s (TeV) L Links
Conference (CONF) notes with preliminary results on data
(Full list of ATLAS CONF notes) Hide table

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Public (PUB) notes with preliminary results on simulated data or interpretations
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Revision 242018-06-22 - LucaFiorini

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Performance Plot for Summer 2018 (May 2018)

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Performance Plot for Summer 2018 (May 2018) NEW

 

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Inverse background efficiency as a function of the signal efficiency with a Boosted Decision Tree (BDT) algorithm for τ_had−vis candidates with a pT>20 GeV and |η|<2.5. The signal efficiencies are obtained using γ*→ττ simulated events. The background efficiencies are derived using multi-jet simulated events and are calculated with respect to all candidates with exactly one (three) reconstructed track. The dots represent the Working points recommended for ATLAS physics analyses: Very Loose, Loose, Medium and Tight.
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Tau Identification and Energy Scale performance: Preliminary Public Plots
 

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Systematic uncertainty on the tau track counting and identification for 1-prong and 3-prong τ_had−vis decays passing the medium identification requirement, as a function of pT. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The uncertainty estimation is performed with 2016 p-p collisions data and the method is similar to that described in ATLAS-CONF-2017-029 for 2015 data.




Systematic uncertainty on the tau energy scale estimated with 2015 and 2016 LHC data as a function of pT and η for 1-prong and 3-prong τhad−vis decays passing the medium identification requirement and whose energy is calibrated using a Boosted Regression Tree (BRT). Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The uncertainty estimation is performed with 2016 p-p collisions data. The BRT calibration and the uncertainty estimation method are described in ATLAS-CONF-2017-029 for 2015 data.




The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2015, 2016 and 2017 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 80 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.



 
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The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2017 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 44 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.




The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2015 and 2016 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 36 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.



 

Performance Plot for HL-LHC Workshop 2017 (October 2017)

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The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2015, 2016 and 2017 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 80 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.




The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2017 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 44 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.



 

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Revision 222018-05-23 - LucaFiorini

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Performance Plot for Summer 2018 (May 2018)


Inverse background efficiency as a function of the signal efficiency with a Boosted Decision Tree (BDT) algorithm for τ_had−vis candidates with a pT>20 GeV and |η|<2.5. The signal efficiencies are obtained using γ*→ττ simulated events. The background efficiencies are derived using multi-jet simulated events and are calculated with respect to all candidates with exactly one (three) reconstructed track. The dots represent the Working points recommended for ATLAS physics analyses: Very Loose, Loose, Medium and Tight.




Systematic uncertainty on the tau track counting and identification for 1-prong and 3-prong τ_had−vis decays passing the medium identification requirement, as a function of pT. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The uncertainty estimation is performed with 2016 p-p collisions data and the method is similar to that described in ATLAS-CONF-2017-029 for 2015 data.




Systematic uncertainty on the tau energy scale estimated with 2015 and 2016 LHC data as a function of pT and η for 1-prong and 3-prong τhad−vis decays passing the medium identification requirement and whose energy is calibrated using a Boosted Regression Tree (BRT). Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The uncertainty estimation is performed with 2016 p-p collisions data. The BRT calibration and the uncertainty estimation method are described in ATLAS-CONF-2017-029 for 2015 data.




The visible mass reconstructed using isolated muons and offline 1-prong and 3-prong τhad−vis candidate passing the medium identification requirement. The Z mass peak is observed in an enriched sample of Z→τ_μ τ_had−vis events from the 2015 and 2016 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 36 fb-1. These events are collected using a single muon trigger. The τhad−vis energy is calibrated using a Boosted Regression Tree (BRT). The energy calibration, event selections and background estimations are described in ATL-CONF-2017-029. The top (bottom) plot shows the mass distribution before (after) applying the in-situ energy correction obtained from the fit of the visible mass. Only statistical uncertainties are shown.



 

Performance Plot for HL-LHC Workshop 2017 (October 2017)

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Revision 212018-05-23 - GianlucaPicco

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Revision 202017-12-07 - AndreasHoecker

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This page features public results from the ATLAS Tau Performance Group.
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Introduction

Public collision plots approved by the tau group which have not been superseded by notes/papers yet.

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Performance plots

 
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Performance plots

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Performance Plot for HL-LHC Workshop 2017 (October 2017)

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Performance Plot for HL-LHC Workshop 2017 (October 2017)

 

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Performance Plot for ICHEP 2016 (July 2016)

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Performance Plot for ICHEP 2016 (July 2016)

 
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Performance plots for LHCC 2015 (December 2015)

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Performance plots for LHCC 2015 (December 2015)

 
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Data vs. MC comparison plots (March 2014)

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Data vs. MC comparison plots (March 2014)

 
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Performance plots for tau identification, tau e veto and tau energy scale (Moriond2013 ID and data set) (February 2013)

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Performance plots for tau identification, tau e veto and tau energy scale (Moriond2013 ID and data set) (February 2013)

 
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Performance plots for Tau Identification and Tau Energy Scale in 2012 (14 August 2012)

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Performance plots for Tau Identification and Tau Energy Scale in 2012 (14 August 2012)

 
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Performance Plots for Tau Identification in 2012 (12 Jun 2012)

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Performance Plots for Tau Identification in 2012 (12 Jun 2012)

 

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Event displays

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Event displays

 
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Z->ττ candidate event display (07 October 2010)

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Z->ττ candidate event display (07 October 2010)

 
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W->τν candidate event display (20 July 2010)

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W->τν candidate event display (20 July 2010)

 

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ATLAS tau lepton public results

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Hadronic Tau Performance

 
This page features public results from the ATLAS Tau Performance Group.

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Results based on data collected with the ATLAS detector

Results from 2010 collision data  NEW 

  • Public results illustrating the performance of the tau identification algorithm with 7 TeV collision data (efficiency and rejection) can be found here.
 
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Results from 2009 collision data

  • Public results illustrating the performance of the tau reconstruction algorithm with 900 GeV collision data can be found here.
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Introduction

Public collision plots approved by the tau group which have not been superseded by notes/papers yet.
 
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Results from 2009 cosmics data

  • Public plots from running the tau algorithms on Cosmics Data can be found here.
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Superseded plots can be found here.
 
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Results based on Monte Carlo simulation studies

Cut-based identification of hadronic tau decays

  • Information related to tau identification studied in MC is available in a public note: ATL-PHYS-PUB-2010-001. It describes a cut-based tau identification (obselete now!).
  • All figures can be found on this dedicated page.
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Performance plots

 
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CSC book

  • You can find the corresponding figures and tables on this dedicated page. The full reference is:
    ATLAS Collaboration,
    Expected Performance of the ATLAS Experiment,
    Detector, Trigger and Physics,
    CERN-OPEN-2008-020, Geneva, 2008.
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Performance Plot for HL-LHC Workshop 2017 (October 2017)


Tau identification efficiency for the three working points (Loose, Medium and Tight) using the algorithm optimized for HL-LHC detector and conditions (``HL-LHC tuning) as a function of pT for reconstructed $\tau$ candidates, shown for one-prong taus.



c_IDEffWRTTruth1PTauJets_ptGeV_log_1P.png

Tau identification efficiency for the three working points (Loose, Medium and Tight) using the algorithm optimized for HL-LHC detector and conditions (``HL-LHC tuning) as a function of pT for reconstructed $\tau$ candidates, shown for three-prong taus.



c_IDEffWRTTruth1PTauJets_ptGeV_log_3P.png

Jet rejection as a function of $\tau$ efficiency for the algorithm optimized for HL-LHC detector and conditions (``HL-LHC tuning) for $\tau$ candidates within $|\eta|<4.0$ (black) as well as for tau candidates restricted to $|\eta|<2.5$ (blue), compared to the Run 2 performance optimized for the Run-2 detector and conditions (``Run-2 performance) for $\tau$ candidates within $|\eta|<2.5$ (green), shown for one-prong taus.



c_ROCComparison_1Pposter.png

Jet rejection as a function of $\tau$ efficiency for the algorithm optimized for HL-LHC detector and conditions (``HL-LHC tuning) for $\tau$ candidates within $|\eta|<4.0$ (black) as well as for tau candidates restricted to $|\eta|<2.5$ (blue), compared to the Run 2 performance optimized for the Run-2 detector and conditions (``Run-2 performance) for $\tau$ candidates within $|\eta|<2.5$ (green), shown for three-prong taus.



c_ROCComparison_3Pposter.png

Performance Plot for ICHEP 2016 (July 2016)


The visible mass reconstructed using isolated muons and offline tau candidates passing the offline loose identification requirement. The Z mass peak is observed in an enriched sample of $Z\to\tau\tau\to\mu\tau$(had) events from the 2016 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 7.1fb-1. These events are collected using a single muon trigger. Event selections and background estimations are described in ATL-PHYS-PUB-2015-025 and in Eur. Phys. J. C75 (2015) 303. Only statistical uncertainties are shown.



Performance plots for LHCC 2015 (December 2015)


(Plot 1:) The BDT tau identification score for offline tau candidates passing the offline medium identification requirement. The tau candidates are observed in an enriched sample of $Z\to\tau\tau\to\mu\tau$(had) events from the 2015 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 3.3fb-1. These events are collected using a single muon trigger. Event selections and background estimations are described in ATL-PHYS-PUB-2015-025 and in Eur. Phys. J. C75 (2015) 303. Only statistical uncertainties are shown.








(Plot 2:) The visible mass reconstructed using isolated muons and offline tau candidates passing the offline medium identification requirement. The Z mass peak is observed with high purity in an enriched sample of $Z\to\tau\tau\to\mu\tau$(had) events from the 2015 dataset in 13 TeV collisions, corresponding to an integrated luminosity of 3.3fb-1. These events are collected using a single muon trigger. Event selections and background estimations are described in ATL-PHYS-PUB-2015-025 and in Eur. Phys. J. C75 (2015) 303. Only statistical uncertainties are shown.

Data vs. MC comparison plots (March 2014)

Performance plots for tau identification, tau e veto and tau energy scale (Moriond2013 ID and data set) (February 2013)


(Plot 1:) Inverse background efficiency as a function of the signal efficiency with a Boosted Decision Tree (BDT) algorithm for 1-prong $\tau_\mathrm{had-vis}$ candidates with a $p_\mathrm{T} > 15$ GeV and $|\eta| < 2.5$. The signal efficiencies are obtained using $Z\to\tau \tau$, $Z'\to\tau \tau$ and $W\to\tau \nu$ simulated events. The background efficiencies are derived using 2012 collision data after applying a multi-jet selection and are calculated with respect to all candidates with exactly one reconstructed track. The Winter 2013 BDT uses $\pi^{0}$-related variables that increase its performance.





(Plot 2:) Inverse background efficiency as a function of the signal efficiency with a BDT algorithm for multi-prong $\tau_\mathrm{had-vis}$ candidates with a $p_\mathrm{T} > 15$ GeV and $ |\eta| < 2.5$. Multi-prong $\tau$ candidates are defined as reconstructed $\tau$ candidates with 2 or 3 tracks and for the signal efficiency only true $\tau$ leptons decaying into three charged particles are considered. The signal efficiencies are obtained using $Z\to\tau\tau$, $Z'\to\tau\tau$ and $W\to\tau\nu$ simulated events. The background efficiencies are derived using 2012 collision data after applying a multi-jet selection and are calculated with respect to all candidates with two or three reconstructed tracks.



(Plot 3:) Signal efficiencies of the Winter 2013 TauBDT for 1-prong $\tau_\mathrm{had-vis}$ candidates as a function of the number of reconstructed vertices for $p_\mathrm{T} > 15$ GeV and $ |\eta| < 2.5$. The identification is performed using a BDT algorithm at a loose, medium or tight working point. The efficiencies are obtained using $Z\to\tau\tau$, $Z'\to\tau\tau$ and $W\to\tau\nu$ simulated events with one reconstructed track with respect to all true taus decaying into one charged particle.



(Plot 4:) Signal efficiencies of the Winter 2013 TauBDT for multi-prong $\tau_\mathrm{had-vis}$ candidates as a function of the number of reconstructed vertices for $p_\mathrm{T} > 15$ GeV and $ |\eta| < 2.5$. The identification is performed using a BDT algorithm at a loose, medium or tight working point. The efficiencies are obtained using $Z \to \tau\tau$, $Z' \to \tau\tau$ and $W \to \tau\nu$ simulated events with two or three reconstructed tracks with respect to all true taus decaying into three charged particles.





(Plot 5:) Background efficiencies of the Winter 2013 TauBDT for 1-prong $\tau_\mathrm{had-vis}$ candidates as a function of the number of reconstructed vertices for $p_\mathrm{T} > 15$ GeV and $ |\eta| < 2.5$. The identification is performed using a BDT algorithm at a loose, medium or tight working point. The efficiencies are derived using 2012 collision data after applying a multi-jet selection and are calculated with respect to all candidates with exactly one reconstructed track.





(Plot 6:) Background efficiencies of the Winter 2013 TauBDT for multi-prong $\tau_\mathrm{had-vis}$ candidates as a function of the number of reconstructed vertices for $p_\mathrm{T} > 15$ GeV and $ |\eta| < 2.5$. The identification is performed using a BDT algorithm at a loose, medium or tight working point. The efficiencies are derived using 2012 collision data after applying a multi-jet selection and are calculated with respect to all candidates with two or three reconstructed tracks.





(Plot 7:) Distribution of the number of tracks associated with hadronically-decaying tau candidates from the Z to tau tau tag & probe selection in 2012 data, before any tau identification requirement is applied. The signal contribution from simulated Z events is outlined in red. The jet background is taken from data control regions, while the electron background is taken from simulated samples. A fit to the distribution of the number of tracks provides the number of hadronically-decaying tau leptons before any identification criteria are applied, for the purpose of the identification efficiency measurement [using the same method as described in ATLAS-CONF-2012-142].





(Plot 8:) Distribution of the number of tracks associated with hadronically-decaying tau candidates from the Z to tau tau tag & probe selection in 2012 data, after the medium tau identification requirement is applied. The signal contribution from simulated Z events is outlined in red. The jet background is taken from data control regions, while the electron background is taken from simulated samples. The 1-prong (multi- prong) template is based on tau candidates with exactly one (two or more) reconstructed tracks in a cone of deltaR<0.2 around the tau axis. A fit to the distribution of the number of tracks provides the number of hadronically-decaying tau leptons after the identification criteria are applied, for the purpose of the identification efficiency measurement [using the same method as described in ATLAS-CONF-2012-142].





(Plot 9:) Distribution of the number of tracks associated with hadronically-decaying tau candidates from the W to tau nu tag & probe selection in 2012 data, before any tau identification requirement is applied. The signal contribution from simulated W events is outlined in red. The jet background is taken from data control regions, while the electron background is taken from simulated samples. A fit to the distribution of the number of tracks provides the number of hadronically-decaying tau leptons before any identification criteria are applied, for the purpose of the identification efficiency measurement [using the same method as described in ATLAS-CONF-2012-142].





(Plot 10:) Distribution of the number of tracks associated with hadronically-decaying tau candidates from the W to tau nu tag & probe selection in 2012 data, after the medium tau identification requirement is applied. The signal contribution from simulated W events is outlined in red. The jet background is taken from data control regions, while the electron background is taken from simulated samples. A fit to the distribution of the number of tracks provides the number of hadronically-decaying tau leptons after the identification criteria are applied, for the purpose of the identification efficiency measurement [using the same method as described in ATLAS-CONF-2012-142].





(Plot 11:) Response curves as a function of the reconstructed visible tau momentum at LC scale for one-prong tau decays in bins of |η|. The momentum range display corresponds to transverse momenta greater than 15 GeV. The tau response is defined as the ratio of the reconstructed visible momentum at LC scale divided by the true visible momentum and binned in the true visible momentum and |η|. Uncertainties are statistical only. The method is equivalent to that described in ATLAS-CONF-2012-064 for 2011 data.





(Plot 12:) Response curves as a function of the reconstructed visible tau momentum at LC scale for multi-prong tau decays in bins of |η|. The momentum range display corresponds to transverse momenta greater than 15 GeV. The multi-prong tau decays refer to the hadronic decay modes with at least two reconstructed tracks. The tau response is defined as the ratio of the reconstructed visible momentum at LC scale divided by the true visible momentum and binned in the true visible momentum and |η|. Uncertainties are statistical only. The method is equivalent to that described in ATLAS-CONF-2012-064 for 2011 data.





(Plot 13:) Systematic uncertainty on the tau energy scale (TES) for 1-prong tau decays in the central region (|η| < 0.3), as a function of PT. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The method is similar to that described in ATLAS-CONF-2012-064 for 2011 data.





(Plot 14:) Systematic uncertainty on the tau energy scale (TES) for multi-prong tau decays in the forward region ( 1.6< |η| < 2.5), as a function of PT. The multi-prong tau decays refer to the hadronic decay modes with at least two reconstructed tracks. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The method is similar to that described in ATLAS-CONF-2012-064 for 2011 data.



(Plot 15:) Momentum resolution for 1-prong tau decays and multi-prong tau decays as function of PT . The multi-prong tau decays refer to the hadronic decay modes with at least two reconstructed tracks. The resolution is calculated as the difference between the reconstructed and generated PT . The resolution is obtained from a Gaussian fit by dividing the σ of the Gaussian by the mean value of generated P. The method is similar to that described in ATLAS-CONF-2012-064 for 2011 data.





(Plot 16:) Background efficiency as a function of signal efficiency with a Boosted Decision Tree (BDT) algorithm for truth-matched 1-prong tau candidates with pT > 15 GeV and eta < 2.47. The signal efficiency is obtained using Z to tau tau simulated events. The background efficiency is obtained using Z to ee simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.





(Plot 17:) Signal efficiency of the Winter 2013 electron veto for truth-matched 1-prong tau candidates as a function of reconstructed transverse momentum for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The signal efficiency is obtained using Z to tau tau simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.





(Plot 18:) Signal efficiency of the Winter 2013 electron veto for truth-matched 1-prong tau candidates as a function of reconstructed transverse momentum for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The signal efficiency is obtained using Z to tau tau simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.




(Plot 19:) Signal efficiency of the Winter 2013 electron veto for truth-matched 1-prong tau candidates as a function of the number of reconstructed vertices for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The signal efficiency is obtained using Z to tau tau simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.




(Plot 20:) Background efficiency of the Winter 2013 electron veto for 1-prong tau candidates as a function of transverse momentum for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The background efficiency is obtained using Z to ee simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.





(Plot 21:) Background efficiency of the Winter 2013 electron veto for 1-prong tau candidates as a function of transverse momentum for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The background efficiency is obtained using Z to ee simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.


(Plot 22:) Background efficiency of the Winter 2013 electron veto for 1-prong tau candidates as a function of the number of reconstructed vertices for pT > 15 GeV and eta < 2.47. The identification is performed using a Boosted Decision Tree (BDT) algorithm at a loose, medium, or tight working point. The background efficiency is obtained using Z to ee simulated events. Candidates are required to pass loose tau identification and not overlap within a cone R=0.2 with a reconstructed electron candidate which passes tight electron identification.




 
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Detector paper

  • All figures from the tau chapter of the ATLAS detector paper can be found here. The information given there is identical to that given on the dedicated CSC page linked above.
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Scientific notes

  • All existing scientific notes are superseded by information from the CSC book.
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Performance plots for Tau Identification and Tau Energy Scale in 2012 (14 August 2012)

 
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(Plot 1:) Final systematic uncertainty on the tau energy scale (TES) for 1-prong decays in the central region (abs(eta)< 0.3), as a function of PT. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The method is equivalent to that described in ATLAS-CONF-2012-064 for 2011 data.










(Plot 2:) Final systematic uncertainty on the tau energy scale (TES) for multi-prong decays in the endcap region, as a function of PT. Each different marker represents a separate source of uncertainty as indicated in the legend. The violet band shows the combined uncertainty from all sources. The method is equivalent to that described in ATLAS-CONF-2012-064 for 2011 data.










(Plot 3:) Transverse momentum resolution for one prong decays in different eta regions as function of PT . The transverse resolution is calculated as the difference between the reconstructed and generated PT . The resolution is obtained from a Gaussian fit by dividing the σ of the Gaussian by the mean value of generated PT.










(Plot 4:) Signal efficiencies for 1-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a projective Log-LikeliHood score. The efficiencies were obtained using Z->ττ, Z'->ττ and W->τν Pythia8 samples.










(Plot 5:) Background efficiencies for 1-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a projective Log-LikeliHood score. The efficiencies were obtained using 2012 dijet data samples with an integrated luminosity of 740 pb-1.










(Plot 6:) Signal efficiencies for multi-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a projective Log-LikeliHood score. The efficiencies were obtained using Z->ττ, Z'->ττ and W->τν Pythia8 samples.










(Plot 7:) Background efficiencies for multi-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a projective Log-LikeliHood score. The efficiencies were obtained using 2012 dijet data samples with an integrated luminosity of 740 pb-1.










(Plot 8:) Signal efficiencies for multi-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a Boosted Decision Tree algorithm. The efficiencies were obtained using Z->ττ, Z'->ττ and W->τν Pythia8 samples.










(Plot 9:) Background efficiencies for multi-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection on all jets discriminants with a pT>20 GeV and |η| <2.3. The identification was performed using a Boosted Decision Tree algorithm. The efficiencies were obtained using 2012 dijet data samples with an integrated luminosity of 740 pb-1.



Performance Plots for Tau Identification in 2012 (12 Jun 2012)

(Plot 1:) Signal efficiencies for 1-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection for pT>20 GeV and |η| <2.3. The identification was performed using a Boosted Decision Tree algorithm. The efficiencies were obtained using Z->ττ, Z'->ττ and W->τν Pythia8 samples.







(Plot 2:) Background efficiencies for 1-prong τ candidates as a function of the number of reconstructed vertices for loose (green), medium (blue) and tight (red) selection for pT>20 GeV and |η| <2.3. The identification was performed using a Boosted Decision Tree algorithm. The efficiencies were obtained using 2012 dijet data samples with an integrated luminosity of 740 pb-1.







(Plot 3:) Inverse background efficiency as a function of the signal efficiency for 1-prong τ candidates with a pT > 20 GeV and |η| < 2.3. The signal efficiencies were obtained using Z->ττ,Z'->ττ and W->τν Pythia 8 samples, while the background efficiencies were derived using 2012 dijet data samples.







(Plot 4:) Inverse background efficiency as a function of the signal efficiency for multi-prong τ candidates with a pT > 20 GeV and |η| < 2.3. Multi-prong τ candidates are defined as reconstructed τ candidates with 2 or 3 tracks and for the signal efficiency only true τ leptons decaying into three charged particles are considered. The signal efficiencies were obtained using Z->ττ,Z'->ττ and W->τν Pythia 8 samples, while the background efficiencies were derived using 2012 dijet data samples.

Event displays

Z->ττ candidate event display (07 October 2010)

This is a display of an event with a candidate Z->τ+τ-->μ+νντ-hν decay in the ATLAS detector where τh denotes a hadronic tau decay.
Event properties:
pT(μ) = 18 GeV
pTvish) = 26 GeV
mvis(μ , τh) = 47 GeV
mT(μ , ETmiss) = 8 GeV
ETmiss = 7 GeV
The hadronic tau candidate has three well identified tracks.
The muon and tau candidate have opposite sign reconstructed charges.
No additional object (electron, muon or jet) was reconstructed in this event.
Z->tautau candidate event display

W->τν candidate event display (20 July 2010)




A candidate for a W->τν decay, with a hadronically decaying tau, collected on 24 May 2010.
Event properties:
pT(τ) = 29 GeV
ETmiss = 39 GeV
Δφ(τ, ETmiss ) = 3.1
mT = 68 GeV

No additional object (electron, muon or jet) was found in the event.


W->taunu candidate event display
 
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Revision 172010-12-09 - PatrickJussel

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  • All figures can be found on this dedicated page.
 

CSC book

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CSC book

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  • Public plots from running the tau algorithms on Cosmics Data can be found here.
 

CSC book

  • The latest information related to taus is available in the tau chapter of the CSC book. You can find the corresponding figures and tables on this dedicated page. The full reference is:

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  ATLAS Collaboration,
Expected Performance of the ATLAS Experiment,
Detector, Trigger and Physics,
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CERN-OPEN-2008-020, Geneva, 2008, to appear.
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  • The latest information related to taus is available in the tau chapter of the CSC book. You can find the corresponding figures and tables on this dedicated page. The full reference is:
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Detector paper

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  • All figures from the tau chapter of the ATLAS detector paper can be found here. The information given there is identical to that given on the dedicated CSC page linked above.
 

Scientific notes

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All figures from the tau chapter of the ATLAS detector paper can be found here.
 

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>
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  • The latest information related to taus is available in the tau chapter of the CSC book. You can find the corresponding figures and tables on this dedicated page. The full reference is:
 
ATLAS Collaboration,
Expected Performance of the ATLAS Experiment,
Detector, Trigger and Physics,
Changed:
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CERN-OPEN-2008-020, Geneva, 2008, to appear.
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Scientific notes

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Public notes

  • Comparison of multivariate methods in identification of hadronic decays of tau leptons (ATL-PHYS-PUB-2006-012) Superseded
    T. Szymocha, M. Wolter
  • An improved tau-Identification for the ATLAS experiment (ATL-PHYS-PUB-2006-008) Superseded
    M. Heldmann, D. Cavalli
>
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Scientific notes

  • All existing scientific notes are superseded by information from the CSC book.
 

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 All figures from the tau chapter of the ATLAS detector paper can be found here.

CSC book

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>
>
You can find all figures and tables of the tau chapter of the CSC book on this dedicated page. The full reference is:
ATLAS Collaboration,
Expected Performance of the ATLAS Experiment,
Detector, Trigger and Physics,
CERN-OPEN-2008-020, Geneva, 2008, to appear.
 

Scientific notes

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  • Hadronic Calorimetry and Jet/τ/ETmiss Performance Studies in ATLAS, B. Caron, SN-ATLAS-2003-029, Eur. Phys. J. C 34 , Suppl. 1 (2004) s139-s149
  • Expected performance of ATLAS for measurements of jets, b-jets, tau-jets, and ETmis, M. Sapinski, SN-ATLAS-2002-012, EPJ Direct 4 S1 (2002) pp.8
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Public notes

Changed:
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<
  • Comparison of multivariate methods in identification of hadronic decays of tau leptons, T. Szymocha, M. Wolter, ATL-PHYS-PUB-2006-012
  • An improved tau-Identification for the ATLAS experiment, M. Heldmann, D. Cavalli, ATL-PHYS-PUB-2006-008
>
>
  • Comparison of multivariate methods in identification of hadronic decays of tau leptons (ATL-PHYS-PUB-2006-012) Superseded
    T. Szymocha, M. Wolter
  • An improved tau-Identification for the ATLAS experiment (ATL-PHYS-PUB-2006-008) Superseded
    M. Heldmann, D. Cavalli
 

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Added:
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META TOPICPARENT name="PhysicsResults"

ATLAS tau lepton public results

Detector paper

All figures from the tau chapter of the ATLAS detector paper can be found here.

CSC book

You can find all figures and tables of the tau chapter of the CSC book (Reference: ATLAS Collaboration, Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics, CERN-OPEN-2008-020, Geneva, 2008, to appear) on this dedicated page.

Scientific notes

  • Hadronic Calorimetry and Jet/τ/ETmiss Performance Studies in ATLAS, B. Caron, SN-ATLAS-2003-029, Eur. Phys. J. C 34 , Suppl. 1 (2004) s139-s149
  • Expected performance of ATLAS for measurements of jets, b-jets, tau-jets, and ETmis, M. Sapinski, SN-ATLAS-2002-012, EPJ Direct 4 S1 (2002) pp.8

Public notes

  • Comparison of multivariate methods in identification of hadronic decays of tau leptons, T. Szymocha, M. Wolter, ATL-PHYS-PUB-2006-012
  • An improved tau-Identification for the ATLAS experiment, M. Heldmann, D. Cavalli, ATL-PHYS-PUB-2006-008

Other sources

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<!--For significant updates to the topic, consider adding your 'signature' (beneath this editing box)-->
Major updates:
-- YannCoadou - 28 Oct 2008

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Responsible: YannCoadou
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