Analysis Info

Group Twiki, mailing lists, etc.

• Single-top Run 2 samples The analysis ntuples are documented.
  

• Top group
• Top WG plenary meetings: Thursdays 15:30 or 16:00
• Top group mailing list:
• Top cross-section subgroup (XS)
• Top cross-section subgroup meetings: Wednesdays 14:00.
• Top cross-section subgroup mailing list: hn-atlas-csctopcrosssection@cernNOSPAMPLEASE.ch

• WbWb twiki: WbWbXSRun2
• WbWb analysis meetings: Tuesdays 16:30
• WbWb analysis group mailing list: atlas-phys-top-wbwb@cernNOSPAMPLEASE.ch
• Analysis contacts: Daniel Britzger (Max-Planck-Institut für Physik München), Michele Faucci Giannelli (INFN e Universita Roma Tor Vergata (IT)), Tadej Novak (Deutsches Elektronen-Synchrotron (DE))

Presently, our analysis group has a mandate for WbWb analyses in the di-lepton and in the l+jets channel. We had been in contact with the top-group and top-cross-section group conveners before about this question, and it was agreed on that we can aim for a combined analysis (di-lepton plus l+jets) or for two analyses - depending on the progess of the two channels and the actual physics messages.

• WWbb l+jets goup twiki

Talks, Meetings

WbWb meetings

• WbWb kick-off meeting on 22 Jan 2020 Measurement of WWbb cross sections in l+jets (Daniel Britzger, S. Kluth) (The analysis idea and some physics motivation are briefly outlined.)
• WbWb meeting on 30 Oct 2020 WWbb (l+jets) (Daniel Britzger)
• WbWb meeting on 16 Mar 2021 A study on the W-tagging efficiency (Daniel Britzger)
• WbWb meeting on 30 Mar 2021 A study on the W-tagging efficiency (Daniel Britzger)
• WbWb meeting on 27 April 2021 WWbb Analysis Status (Charlie Chen)
• WbWb meeting on 07 Feb 3023 Study of the phase space definition - Update (Johannes Hessler), efficiency and acceptance correction factors in unfolding.
• WbWb meeting on 18 Apr 2023 Study of the phase space definition Update (Johannes Hessler)
• WbWb meeting on 25 Apr 223 Study of the phase space definition Update (Johannes Hessler)
• WbWb meeting on 23 May 2023 Study of the phase space definition Update (Johannes Hessler)
• WbWb meeting on 4 Jul 2023 Study of the WbWb phase space region Update (Johannes Hessler)
• WbWb meeting on 18 Jul 2023 Reconstructing Whad + b (Johannes Hessler)
• WbWb meeting on 18 Jul 2023 Unfolding Status (Eleonora Loiacono, Tadej Novak)
• WbWb meeting on 25 Jul 2023 WbWb region Updat (Johannes Hessler)
• WbWb meeting on 24 Oct 2023 WbWb Analysis & W+Jets Fit (Tadej Novak)

ttbar NNLO reweighting

• WWbb meeting on 30 Aug 2022 ttbar NNLO Reweighting Effect (Tadej Novak)
• Top Modelling Meeting, 30 Jul 2020 ttbar Reweighting Reloaded: a fresh new look at ttbar parton-kinematics reweighting to NNLO distributions (Michele Pinamonti)

Top cross section meetings

• Top Cross-Section Meeting on 22 Jan 2020 WbWb kick-off meeting.
• Top Cross-Section Meeting on 03 Feb 2021 WWbb Analysis Status (Federico G. Diaz Capriles)
• Top Cross-Section Meeting on 29 Apr 2021 Differential tt(+jets) cross sections in the ℓ+jets channel with 139 fb-1ATLAS data (particle level) (Claudia Glasman)
• Top Cross-Section Meeting on 13 Apr 2022 Differential Cross Section Measurements of pp→WWbb in the Lepton + Jets Channel (Charlie Chen)
• Top Cross-Section Meeting on 25 Jan 2023 The WbWb cross-section measurement in semi-leptonic channel (Thomas Mclachlan)
• Top Cross-Section Meeting on 13 Sep 2023 Differential cross-section measurement of WbWb production in the lepton+jets channel at √s = 13 TeV with the ATLAS detector (Thomas Mclachlan): EB request meeting
• Top Cross-Section Meeting on 27 Mar 2024 Differential Cross Section Measurements of pp→WWbb in the Lepton + Jets Channel (Charlie Chen)

EB meetings

• TOPQ-2-23-31 WbWb lepton+jets EB meeting on 4 Dec 2023 WbWb Lepton+Jets Analysis Overview (Tadej Novak,)

Workshop, conference

• Top Working Group Workshop 2021, 15 - 18 Jun 2021
• ATLAS top workshop 2022, 4 - 6 May 2022 Good intro/tutorial to AnalysisTop and ML.

• TOP2020, 14-18 Sep 2020 Conference timetable
• TOP2020, 15 Sep 2020 Theoretical issues in event generation (Silvia Ferrario Ravasio) (NLO+PS Monte-Carlo generators with a full non-resonant aware matching are in development, p3-6)
• TOP2021, 13-17 Sep 2021
• TOP2021, 13 Sep 2021 Flavored jets in top physics and beyond (Michal Wiktor Czakon) (the need for correctly defined flavored jets in NNLO, propose a new flavor anti-kt algorithm)

Theory papers

Overview

• arXiv:2008.11133 (hep-ph) NNLO QCD corrections to leptonic observables in top-quark pair production and decay (Michal Czakon, Alexander Mitov, Rene Poncelet) (An excellent summary on many theoretical and experimental issues in top-quark measurements. Most notably the introduction gives an excellent overview.)

• arXiv:2103.16384 (hep-ex) Measuring standard model parameters using top-quark cross sections in ATLAS and CMS

pp->WbWb

• arXiv:1012.3975 (hep-ph) NLO QCD corrections to WWbb production at hadron colliders (A. Denner, S. Dittmaier, S. Kallweit, S. Pozzorini)
• arXiv:1207.5018 (hep-ph) NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders (Ansgar Denner, Stefan Dittmaier, Stefan Kallweit, Stefano Pozzorini) (see fig 3)
• arXiv:1412.1828 (hep-ph) Top-pair production and decay at NLO matched with parton showers (John M. Campbell, R. Keith Ellis, Paolo Nason, Emanuele Re)

pp->lvbbq

• arXiv:1711.10359 (hep-ph) Off-shell production of top-antitop pairs in the lepton+jets channel at NLO QCD (Ansgar Denner, Mathieu Pellen)
• arXiv:1607.05571 (hep-ph) NLO electroweak corrections to off-shell top-antitop production with leptonic decays at the LHC (Ansgar Denner, Mathieu Pellen)

Others

Bootstrap Method

• ATL-PHYS-PUB-2021-011 Evaluating statistical uncertainties and correlations using the bootstrap method

Smoothing

• arXiv:2112.01548 (physics.data-an) The Linear Template Fit (Daniel Britzger)

b-tagging

• ATL-PHYS-PUB-2017-013 Optimisation and performance studies of the ATLAS b-tagging algorithms for the 2017-18 LHC run
• arXiv:1907.05120 (hep-ex) ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV

Unfolding

• ATL-COM-PHYS-2018-483 Measurements of tt¯ differential cross-sections in the all-hadronic channel with the ATLAS detector using highly boosted top quarks in pp collisions at s√=13 TeV with the full Run 2 dataset

MC samples

• DR = Diagram Removal
• DS = Diagram Subtraction

Fiducial and Signal Regions

• spreadsheet

Analysis code

• WWbbLoop currently used for the di-lepton analysis
• WWbb intended by Daniel for the l+jets analysis. There are infact two analysis packages included. One by Andrii (neowwbb) and one by Daniel WWbb (libwwbb)

Tadej's code

• gitLab: TNAnalysis Unfolding
• gitLab: WbWbAnalysis Analysis

TOPQ1 DAOD

• TOPQ1.py
• TOPQCommonSelection.py

  # TOPQ1 (single top)
  #   >=1 electron(pT>20 GeV) OR
  #   >=1 muon(pT>20 GeV)
  EL20 = "(Electrons.pt > 20*GeV && abs(Electrons.eta) < 2.7 && Electrons.DFCommonElectronsLHLoose)"
  MU20 = "(Muons.pt > 20*GeV && abs(Muons.eta) < 2.7 && Muons.muonType == 0 && Muons.DFCommonGoodMuon)"

• Muon_v1.h

    enum MuonType {
      Combined, MuonStandAlone, SegmentTagged, CaloTagged, SiliconAssociatedForwardMuon
    };

SingleTop ntuple

• SingleTopConfig.py
• Single-Top ntuples

-- KenjiHamano - 2020-11-06