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Hadronic calibration workshop 2009
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Europe/Zurich
Foz do Arelho (Portugal)
Foz do Arelho (Portugal)
Jimmy Proudfoot
(High Energy Physics Division),
Tancredi Carli
(CERN)
Description
This workshop reviews the status of the Jet and Etmiss reconstruction and calibration in the Atlas experiment. The focus of the workshop is to define the calibration and analysis strategies
of the 2010 data. Future directions will be discussed.
The format of the workshop follows the tradition of the previous workshops with emphasis on discussions. Based on the material submitted, the session conveners will guide the discussion.
Overall schedule:
* Tuesday 23:
Lectures and introductions to QCD, energy reconstruction and hadronic calibration in ATLAS.
It is recommended that all people who are not yet familiar with the Atlas hadronic
calibration strategies attend these lectures. In particular, students and new-comers are invited.
* Wednesday 24:
Test-beam, detector performance, local hadron calibration and jet calibration and long term
Monte Carlo tuning
* Thursday 25:
Will be devoted to establish the jet energy scale in the 2010 data
* Friday 26:
Will discuss the reconstruction and calibration of the missing transverse energy including results
from the 2008/9 commisioning data. Also DPD and trigger aspects will be discussed.
* Saturday 27:
Will summarise the work-shop and discuss future directions. A workshop review panel will
work-out and present action items, identify open points and given recommendations.
For all pratical information see:
https://web.lip.pt/atlas-workshop/index.php
The detailed topics and points to be discussed for each session can be found on
https://twiki.cern.ch/twiki/bin/view/AtlasProtected/HadronicCalibrationWorkshop09
Please, submit material directly to the agenda. Look at the Example test session
on Wednesday morning 6:00-8:00. The modification password is jetrec
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10:45
coffee break
- 3
- 4
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12:30
lunch break
- 5
- 6
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15:30
coffee break
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7
Jet and Etmiss reconstruction and calibration - part IISpeaker: Peter Loch (University of Arizona)
- 8
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- 10
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Welcome drink
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Welcome by the organisers
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Test-beam and detector performance
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13
Introduction and Overview of session
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16
ATLAS performance: noise status and overall qualitySpeaker: Irene Vichou (U of Illinois at Urbana-Champaign)
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17
TB vs. MC comparison in endcapsSpeaker: Peter Schacht (MPI)
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18
CTB EMEC/HEC/FCAL TB vs. MCSpeaker: Mr Pavol Strizenec (IEP)more information
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19
TB vs. MC comparison in barrelSpeaker: Tomas Davidek (Institute of Particle and Nuclear Physics)
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13
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11:00
coffee break
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Tuning of simulation and detector description
- 20
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- 23
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13:00
lunch break
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Local hadron calibration
- 24
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27
Material: Charged pion and electron moments from CTB2004 dataSpeaker: Pavol Strizenec (IEPSAS-Kosice)
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16:00
coffee break
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buffet
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Jet energy scale - Part I
Overview of the the Jet energy scale session
o Calibration schemes
o Factorized corrections
o Tests and systematicsInputs to jet reconstruction:
o towers
o topo-towers
o clustersPile-up offset correction
- 34
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11:00
coffee break
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Jet energy scale: Part II
Jet corrections: Relative Eta correction across the calorimeter
* Description of technique (traditional, 2D), event selection, trigger * Performance at the EM scale, after cell-density, after local hadron * Validation + pile-up effect * Systematic uncertaintiesJet corrections: Absolute response
* Corrections based on MC o Simple pT-Eta correction o Jet-moment corrections * Corrections based on Data o Z/gamma+jet balance o Missing pT fraction (MPF) * Extrapolation to high Pt- 39
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40
Absolute Correction (Pt and Eta) using MonteCarlo
- 41
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42
gamma+Jet Balance
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13:00
lunch break
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Jet energy scale: Part III
Jet corrections: Out-of-cone corrections
* EM scale, H1 and LC jets * Systematic uncertainties * Etmiss consistencyJet corrections: configurations with close by jets
* Present status and future strategyJet corrections: Order of corrections
Closure tests* W-mass constrained in top pairs * gamma/Z-balance * Drell-Yan pairs * Jet shapes : Data-MC comparison- 59
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16:00
lunch break
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Jet energy scale: Part IV
Jet energy resolution improvement after calibration
* Jet vertex fraction event-by-event pile-up correction * Layer energy fraction corrections * Track-based response correctionsMethodology to establish a systematic jet energy scale uncertainty
- 69
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- 74
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workshop dinner
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Before collision data: Cosmic clean-up and cell masking (and Data Quality and monitoring issues)
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11:00
coffee break
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MET calibration with first collisions
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88
From basic ETmiss to Refined Calibration, step by step procedureSpeaker: Silvia Resconi (Dipartimento di Fisica)
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91
MET tails
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b) MET tails in dijet eventsSpeaker: David Berge
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88
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13:00
lunch break
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In-situ Etmiss performance and closure with first 10-100 pb^-1
- 92
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93
Material: EtMiss scale in ZtautauSpeaker: Donatella Cantore-Cavalli (Dipartimento di Fisica)
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16:00
coffee break
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Data analysis using DPD and triggers
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11:00
coffee break
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Conclusion of the workshop: Open Issues & Action items
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109
Concluding discussion on Test-beam, Monte Carlo and Cell-level CalibrationSpeaker: Majorie Shapiro
- 110
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109
