Presentation is loading. Please wait.

Presentation is loading. Please wait.

Hadronic Jet Energy Scale Hadronic t-t bar selection and Jet Energy Scale calibration Part I : Accessing the trigger information 09/02 - Menelaos Tsiakiris.

Published byTheodore Chambers Modified over 9 years ago

Similar presentations

Presentation on theme: "Hadronic Jet Energy Scale Hadronic t-t bar selection and Jet Energy Scale calibration Part I : Accessing the trigger information 09/02 - Menelaos Tsiakiris."— Presentation transcript:

1 Hadronic Jet Energy Scale Hadronic t-t bar selection and Jet Energy Scale calibration Part I : Accessing the trigger information 09/02 - Menelaos Tsiakiris

2 Motivation… Main decay modes:  di-lepton: tt bar  lν lν bb 5% (e + μ)  lepton + jets: tt bar  lν qq bb 30% (e + μ)  all hadronic : tt bar  qq qq bb 45% qq bar (10%), gg (90%)  tt bar Dominant quark production mechanism t  Wb (~100%) quarks (light jets) b quark jets (displaced vertices) Pros: + Largest branching ratio + Kinematics that can be fully reconstructed Cons: - very large QCD multijet background challenging for the isolation of the signal - difficulties for triggering

3 Tools… Atlas offline – Athena  currently on 12.0.4 Sample 5012 (QCD) AOD di-jet sample reco. with trigger info trig1_misal1_csc11_005012.J3_pythia_jetjet.recon.AOD.v12000402 Sample 5200 (ttbar) AOD semi-leptonic sample reco. with trigger info trig1_misal1_csc11_005200.T1_McAtNlo_Jimmy.recon.AOD.v12000402 UserAnalysis (00-08-43) package  very basic stuff… Trigger Decision Class (by M.Wielers)  access the trigger information List of predefined trigger menus in release 12 : https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerMenuVersions Contains the trigger menu items as defined at reconstruction. Trigger Menu : 12.0.4  official production CSC-03

4 About Trigger Decision … Obtains the trigger decision for each event Gives the list of signatures running in each trigger level Implemented from 11.0.5 - fully functional on 12.0.x From 12.0.4 also included in AODs TriggerDecisionMaker TriggerDecisionMaker Algorithm  runs after the trigger steering  determines which HLT or LVL1 items were satisfied  fills the TriggerDecision object TriggerDecision class  User Interface: … bool isDefined(“L1_2J45”) bool isTriggered(“L1_2J45”) bool isTriggerPassed() void print() void printAccepted() … Starting point: Wiki page: https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerDecision https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerDecision Browse code @ CVSView and documentation @ DoxygenCVSViewDoxygen Methods…

5 More on Trigger Decision… How-to use: cmt/requirement i) Include the Trigger, in the cmt/requirement  use TrigSteeringEvent TrigSteeringEvent-* Trigger/TrigEvent AnalysisSkeleton.cxx ii) Edit AnalysisSkeleton.cxx  #include "TrigSteeringEvent/TriggerDecision.h" StoreGate iii) Retrieve the trigger decision from StoreGate  /** Get Trigger Decision */ const TriggerDecision* trigDec = 0; MyTriggerDecision StatusCode sc = m_storeGate->retrieve( trigDec, MyTriggerDecision); if( sc.isFailure() || !trigDec) { mLog << MSG::WARNING << "No Trigger Decision found in TDS" << endreq; return StatusCode::SUCCESS; } Need more insight? https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerAnalysisTutorial https://twiki.cern.ch/twiki/bin/view/Atlas/TriggerAnalysisTutorial !!! This is only for handling the MSG service trigDec->isTriggered(“L1_J35”) Returns true/false Default key In case you re-run the trigger hypothesis on an ESD/AOD + MyTriggerDecision+ e.g

6 Reco container Trigger Decision if (accepted) accepted_histo Fill accepted_histo Truth container findAMatch highest_truth_histo Fill highest_truth_histo Divide Find highest energetic jet Turn – on curve : For a trigger request of: E > 50 GeV The percentage of jets that pass the energy threshold with respect to their true energy E truth My analysis: Per event… Ideal…

7 jet160 The jet160 item turn-on curves (5012): LVL1: L1_J45 (20GeV) LVL2: L2_ jet160 EF: EF_jet160 !!! “garbage” at low energies !?!?

8 Reco container Trigger Decision if (accepted) accepted_histo Fill accepted_histo Truth container findAMatch highest_truth_histo Fill highest_truth_histo Divide Find highest energetic jet Offline reconstruction algorithm Trigger Reco Container Trigger reconstruction algorithm Fast solution… Truth container Find highest energetic jet Trigger Decision if (accepted) Divide highest_truth_histo Fill highest_truth_histo accepted_histo Fill accepted_histo

9 jet160 The jet160 item turn-on curves (5012): The “garbage” are gone… ! But for this sample the jet160 item is not good …. Very few events  next slide

10 jet160 The jet160 item (5012): Truth distribution Only very few events above 180 GeV

11 2jet120 The 2jet120 item (5012): LVL1: L1_2J45 LVL2: L2_ jet120L2_jet120 EF: EF_jet120EF_jet120 Note the naming convention for L2 and EF! Still few statistics based

12 New sample 5200. Semi-leptonic ttbar… … just looked at it a few days ago … very few events after 220 GeV ! Truth distribution

13 The jet160 item on a 5200 sample, 4000 events: 90 – 100% Starts building up after 160 GeV Bit sloppy here… ~ 80% -100% AnalysisSkeleton INFO The L1 J45 : 3987  ~100% AnalysisSkeleton INFO The L2 jet160 : 2281  57% AnalysisSkeleton INFO The EF jet160 : 421  11%

14 The 2jet120 item (5200) 4000 events: ~ 80% - 90% ~ 50% - 60% Starts to build up only after 120 GeV AnalysisSkeleton INFO The L1 2J45 : 3859  96% AnalysisSkeleton INFO The L2 2jet120 : 1930  48% AnalysisSkeleton INFO The EF 2jet120 : 278  7%

15 The 3jet65 item (5200) 4000 events: LVL1: L1_3J45 LVL2: L2_ jet65L2_jet65L2_jet65 EF: EF_jet65EF_jet65EF_jet65 ~ 80% - 90% ~ hardly 40 - 50% Again… AnalysisSkeleton INFO The L1 3J45 : 3434  85% AnalysisSkeleton INFO The L2 3jet65 : 2508  63% AnalysisSkeleton INFO The EF 3jet65 : 522  13% ~ 90% !

16 The 4jet50 item (5200) 4000 events: LVL1: L1_4J45 LVL2: L2_ jet50L2_jet50L2_jet50L2_jet50 EF: EF_jet50EF_jet50EF_jet50EF_jet50 AnalysisSkeleton INFO The L1 2J45 : 2392  60% AnalysisSkeleton INFO The L2 2jet120 : 1771  44% AnalysisSkeleton INFO The EF 2jet120 : 406  10 % No more than 40% ~ 60% - 70% ~ 70 % !!! again 3987 passed LVL1 : 99% 3137 passed LVL2 : 78% 857 passed EF : 21% Total accepted events:

17 About Jet Energy Scale… The efficiency of the jet triggers depends heavily on the quality of the Jet Energy Scale calibrations in the online system. For the di-jet 5012 sample As an introduction to this study I looked on the JES based on offline reconstruction

18 JES JES : Fitting each bin of the x-axis with a gaussian and plotting the Constant(height), Mean and Sigma Offset of 2 GeV The distribution is getting wider for high energies (less events ?) 5012 di-jet sample

19 About Jet Energy Scale… For the ttbar 5200 sample

20 JES JES : 5200 ttbar sample Not the same as 5012 !

21 My to-do list … Run the online reconstruction algorithm. (Samples ??) Do the turn-on curves based on the trigger reco. algorithm and improve diagrams (e.g. errors) Examine JES for the online case Look into EventView Trigger package https://twiki.cern.ch/twiki/bin/view/Atlas/EventViewTrigger

22 THANK YOU!

Download ppt "Hadronic Jet Energy Scale Hadronic t-t bar selection and Jet Energy Scale calibration Part I : Accessing the trigger information 09/02 - Menelaos Tsiakiris."

Similar presentations

Freiburg Seminar, Sept. 2005 Sascha Caron Finding the Higgs or something else ideas to improve the discovery ideas to improve the discovery potential at.

Freiburg Seminar, Sept Sascha Caron Finding the Higgs or something else ideas to improve the discovery ideas to improve the discovery potential at.
J. Nielsen1 Measuring Trigger Efficiency Important component of cross section measurement: it is NOT in general 1.0! Need to measure this from data because.

J. Nielsen1 Measuring Trigger Efficiency Important component of cross section measurement: it is NOT in general 1.0! Need to measure this from data because.
TriggerDecision Trigger AOD discussion 13 December 2006 Ricardo Gonçalo - RHUL.

TriggerDecision Trigger AOD discussion 13 December 2006 Ricardo Gonçalo - RHUL.
1 Data Analysis II Beate Heinemann UC Berkeley and Lawrence Berkeley National Laboratory Hadron Collider Physics Summer School, Fermilab, August 2008.

1 Data Analysis II Beate Heinemann UC Berkeley and Lawrence Berkeley National Laboratory Hadron Collider Physics Summer School, Fermilab, August 2008.
Atlantis Event Display with AOD and EV ntuples Juergen Thomas* on behalf of the Atlantis team: *University of Birmingham (UK) University College London.

Atlantis Event Display with AOD and EV ntuples Juergen Thomas* on behalf of the Atlantis team: *University of Birmingham (UK) University College London.
Current limits (95% C.L.): LEP direct searches m H > 114.4 GeV Global fit to precision EW data (excludes direct search results) m H < 157 GeV Latest Tevatron.

Current limits (95% C.L.): LEP direct searches m H > GeV Global fit to precision EW data (excludes direct search results) m H < 157 GeV Latest Tevatron.
1 The ATLAS Missing E T trigger Pierre-Hugues Beauchemin University of Oxford On behalf of the ATLAS Collaboration Pierre-Hugues Beauchemin University.

1 The ATLAS Missing E T trigger Pierre-Hugues Beauchemin University of Oxford On behalf of the ATLAS Collaboration Pierre-Hugues Beauchemin University.
TriggerDecision update PESA-Algorithms – 16 November 2006 Status in rel.12.0.4 nightlies Next steps for TriggerDecision Other random bits of news Ricardo.

TriggerDecision update PESA-Algorithms – 16 November 2006 Status in rel nightlies Next steps for TriggerDecision Other random bits of news Ricardo.
Skeleton outline for the physics case document M. Shochet December 15, 2005.

Skeleton outline for the physics case document M. Shochet December 15, 2005.
September 27, 2005FAKT 2005, ViennaSlide 1 B-Tagging and ttH, H → bb Analysis on Fully Simulated Events in the ATLAS Experiment A.H. Wildauer Universität.

September 27, 2005FAKT 2005, ViennaSlide 1 B-Tagging and ttH, H → bb Analysis on Fully Simulated Events in the ATLAS Experiment A.H. Wildauer Universität.
CSC Note Jet 8 Meeting – April 11 '07 Status and plan for single hadron scale check with minimum bias events N. Davidson The University of Melbourne.

CSC Note Jet 8 Meeting – April 11 '07 Status and plan for single hadron scale check with minimum bias events N. Davidson The University of Melbourne.
Top Turns Ten March 2 nd, 2005. Measurement of the Top Quark Mass The Low Bias Template Method using Lepton + jets events Kevin Black, Meenakshi Narain.

Top Turns Ten March 2 nd, Measurement of the Top Quark Mass The Low Bias Template Method using Lepton + jets events Kevin Black, Meenakshi Narain.
Kevin Black Meenakshi Narain Boston University

Kevin Black Meenakshi Narain Boston University
Daniele Benedetti CMS and University of Perugia Chicago 07/02/2004 High Level Trigger for the ttH channel in fully hadronic decay at LHC with the CMS detector.

Daniele Benedetti CMS and University of Perugia Chicago 07/02/2004 High Level Trigger for the ttH channel in fully hadronic decay at LHC with the CMS detector.
Update on Tools FTK Meeting 06/06/06 Erik Brubaker U of Chicago.

Update on Tools FTK Meeting 06/06/06 Erik Brubaker U of Chicago.
Sept 30 th 2004Iacopo Vivarelli – INFN Pisa FTK meeting Z  bb measurement in ATLAS Iacopo Vivarelli, Alberto Annovi Scuola Normale Superiore,University.

Sept 30 th 2004Iacopo Vivarelli – INFN Pisa FTK meeting Z  bb measurement in ATLAS Iacopo Vivarelli, Alberto Annovi Scuola Normale Superiore,University.
On the Trail of the Higgs Boson Meenakshi Narain.

On the Trail of the Higgs Boson Meenakshi Narain.
Status of  b Scan Jianchun Wang Syracuse University Representing L b scanners CLEO Meeting 05/11/02.

Status of  b Scan Jianchun Wang Syracuse University Representing L b scanners CLEO Meeting 05/11/02.
1 Measuring the Top Quark Cross Section in the Semileptonic Channel Andrea Bangert.

1 Measuring the Top Quark Cross Section in the Semileptonic Channel Andrea Bangert.
S. Martí i García Liverpool December 02 1 Selection of events in the all-hadronic channel S. Martí i García CDF End Of Year Review Liverpool 16-17 / December.

S. Martí i García Liverpool December 02 1 Selection of events in the all-hadronic channel S. Martí i García CDF End Of Year Review Liverpool / December.

Similar presentations

Ads by Google