All hadronic ttbb analysis

Theory information

• https://arxiv.org/pdf/1610.07922.pdf - LHC Higgs Cross-Section WG Yellow Report
• https://indico.cern.ch/event/669831/ - Theory: Common meeting on tt+b-jet backgrounds to ttH(bb)
• https://indico.cern.ch/event/686494/contributions/3040042/attachments/1669643/2677951/HEHL-Higgs.pdf - Fabrizio Caola's talk at thel workshop HL-HE LHC

• https://arxiv.org/abs/1010.0632 - Improved iterative Bayesian unfolding -G. D'Agostini

Papers and other publications

• https://arxiv.org/pdf/hep-ph/0202174.pdf - Adam K. Leibovich and David Rainwater -- Increased Yield oft ttbb at Hadron Colliders in Low-EnergySupersymmetry
• https://arxiv.org/abs/1701.04427 -- ttbb as a probe of New Physics at the LHC
• https://www.uzh.ch/cmsssl/physik/dam/jcr:063755ac-e64a-4270-b209-5190b653a7d5/10_poster.pdf -- Poster -- conf. note ttbb measurements in the all-hadronic channel in CMS
• https://arxiv.org/pdf/1909.05306.pdf -- paper ttbb measurements in the all-hadronic channel in CMS
• https://link.springer.com/content/pdf/10.1007%2FJHEP04%282019%29046.pdf - ATLAS ttbb publication at 13 TeV
• http://cds.cern.ch/record/2675029/files/TOP-18-011-pas.pdf - CMS all-had ttbb publication at 13 TeV
• https://arxiv.org/pdf/1910.14535v1.pdf - Identification of additional jets in the t-tbar b-bbar events using neural network
• https://cds.cern.ch/record/2214130/files/ATL-PHYS-PROC-2016-137.pdf - Charged Higgs boson searches in ATLAS and CMS
• https://arxiv.org/pdf/1005.4409.pdf - Long-lived charged Higgs at LHC as a probe of scalarDark Matter
• https://cds.cern.ch/record/1644428 - CDS page internal note on the all-had. top quark measurements at 8 TeV in ATLAS
• https://cds.cern.ch/record/2125782 - CDS page, Tom's Thesis all-had. top quark measurements at 8 TeV in ATLAS
• https://publications.mppmu.mpg.de/2009/MPP-2009-132/FullText.pdf - MPP page, E. Rauter's thesis "Top Quark Mass Measurement" With matching information

ATLAS information

• https://indico.cern.ch/event/684782/ -Top Workshop 17-19 April 2018 : On the way to high precision
• See talk of U. de Sanctis https://indico.cern.ch/event/684782/contributions/2953729/attachments/1634778/2608155/BfragmentationTop_Umberto.pdf and Andrea Knue https://indico.cern.ch/event/684782/contributions/2953731/attachments/1634972/2608075/TopWorkshop_MCissues_AndreaKnue.pdf
• PMG page with MC information: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/CentralMC16ProductionList
• PMG page with MC generation info https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/PmgMcSoftware#Versions_release_21_6_AthGenerat
• Internal note ttH https://gitlab.cern.ch/atlas-physics-office/SUSY/ANA-SUSY-2018-38/ANA-SUSY-2018-38-INT1/blob/master/ANA-SUSY-2018-38-INT1.pdf

KLFitter information

• KLFitter documentation - https://github.com/KLFitter/KLFitter/blob/master/doc/WhatIsKLF.md
• Twiki page - https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/KLFitter
• KLFitter mailing list - KLFitter-Users@cernNOSPAMPLEASE.ch

Monte Carlo samples:

*mc16_13TeV.411068.PhPy8EG_A14NNPDF23_NNPDF30ME_ttbb4F_PhOL_hdampHThalf_semilep.deriv.DAOD_TOPQ1.e6765_e5984_a875_r9364_r9315_p3598_tid15796803_00 *mc16_13TeV.411069.PhPy8EG_A14NNPDF23_NNPDF30ME_ttbb4F_PhOL_hdampHThalf_dilep.deriv.DAOD_TOPQ1.e6784_e5984_a875_r9364_r9315_p3598_tid15796808_00 *mc16_13TeV.411070.PhPy8EG_A14NNPDF23_NNPDF30ME_ttbb4F_PhOL_hdampHThalf_allhad.deriv.DAOD_TOPQ1.e6938_e5984_a875_r9364_r9315_p3654_tid15875824_00

Monte Carlo samples request:

• See ATLAS Top WG twiki page: https://twiki.cern.ch/twiki/bin/view/Sandbox/MCrequestHowTo#Make_your_case_as_a_requester
• See ATLMCPROD page: https://its.cern.ch/jira/projects/ATLMCPROD/issues/ATLMCPROD-8060?filter=allopenissues
• See request made for the new POWHEG ttbb l+jets samples: https://its.cern.ch/jira/browse/ATLMCPROD-9179?jql=text%20~%20%22ttbb%22

Git repository analyses code and internal Note

• Gitlab Margherita's

repository (see also for documentation): https://gitlab.cern.ch/mspalla/analysis_ttbballhad/tree/master

• New Gitlab repository: https://gitlab.cern.ch/MPP-HEC/allhadttbb"
• Gitlab old ttbar top mass measurement repository: https://gitlab.cern.ch/MPP-HEC/allhadttbar"
• New Gitlab repository for our intnote https://gitlab.cern.ch/MPP-HEC/intallhadttbb"

LHCPhysics Web Page links

• Main LHC Physics web page link: https://twiki.cern.ch/twiki/bin/view/LHCPhysics/WebHome
• lLHC Higgs Cross Section Working Group 1ink: https://twiki.cern.ch/twiki/bin/view/LHCPhysics/LHCHWG1

Analysis ttbb Event selection

Preselection

Cut in config file	Description
INITIAL	framework default
GRL	GRL used: see below
PRIVTX	Primary vertex (framework default)
GOODCALO	framework default, probably 'no calorimeter errors'
NOBADMUON	framework default
TTBB_TTBAR_VETO	remove ttbb events from ttbar MC to avoid double counting, acts on parton-level
CUT_MC_WEIGHT	remove MC events with too large event weight (w>1000)
EL_N 25000 == 0	No electrons with pt>25 GeV
MU_N 25000 == 0	No muons with pt>25 GeV
MET < 60000	Missing Et < 60 GeV
JET_N 25000 >= 8	At least 8 jets of pt>25 GeV and abs(eta)<2.5

Good Run List (GRL) and PileUp reweighting files used:

Year	files
2018	PRWConfigFiles_FS dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16e.FS.v2/prw.merged.root
	PRWConfigFiles_AF dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16e.AF.v2/prw.merged.root
	PRWActualMu_FS GoodRunsLists/data18_13TeV/20190318/physics_25ns_Triggerno17e33prim.actualMu.OflLumi-13TeV-010.root
	PRWActualMu_AF GoodRunsLists/data18_13TeV/20190318/physics_25ns_Triggerno17e33prim.actualMu.OflLumi-13TeV-010.root
	PRWLumiCalcFiles GoodRunsLists/data18_13TeV/20190318/ilumicalc_histograms_None_348885-364292_OflLumi-13TeV-010.root
2017	PRWConfigFiles_FS dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16d.FS.v2/prw.merged.root
	PRWConfigFiles_AF dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16d.AF.v2/prw.merged.root
	PRWActualMu_FS GoodRunsLists/data17_13TeV/20180619/physics_25ns_Triggerno17e33prim.actualMu.OflLumi-13TeV-010.root
	PRWActualMu_AF GoodRunsLists/data17_13TeV/20180619/physics_25ns_Triggerno17e33prim.actualMu.OflLumi-13TeV-010.root
	PRWLumiCalcFiles GoodRunsLists/data17_13TeV/20180619/physics_25ns_Triggerno17e33prim.lumicalc.OflLumi-13TeV-010.root
2016/15	PRWConfigFiles_FS dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16a.FS.v2/prw.merged.root
	PRWConfigFiles_AF dev/AnalysisTop/PileupReweighting/user.iconnell.Top.PRW.MC16a.AF.v2/prw.merged.root
	PRWLumiCalcFiles GoodRunsLists/data15_13TeV/20170619/PHYS_StandardGRL_All_Good_25ns_276262-284484_OflLumi-13TeV-008.root GoodRunsLists/data16_13TeV/20180129/PHYS_StandardGRL_All_Good_25ns_297730-311481_OflLumi-13TeV-009.root

2b2j trigger

• Triggers used:
  • 2018: HLT_2j35_bmv2c1060_split_2j35_L14J15.0ETA25
  • 2017: HLT_2j25_gsc45_bmv2c1060_split_2j25_gsc45_boffperf_split_L14J15.0ETA25
  • 2016: HLT_2j35_bmv2c2060_split_2j35_L14J15.0ETA25
  • 2015: ??
• Offline cut:
  • At least 4 jets of pt>55 GeV
  • At least 2 of these jets must be b-tagged (MV2c10 @ 60% WP)

7j trigger

• Triggers used:
  • 2018 / 2017 / 2016: HLT_7j45_L14J15
  • 2015: ??
• Offline cut:
  • At least 7 jets of pt>55 GeV

ttbar reconstruction in ttbb events

• KLFitter 3-1-10, 1T Likelihood.
  • Alternative: chi2, parametric or not.
• Latest summary: presentation at Top Reconstruction.
• Merge request of KLFitter to athena: !37695
• KLfitter Likelihood cut: log(L) > -50

Extra two b-jets reconstruction in ttbb events

Select in the event two extra b-jets with the largest b-tag weight (MV2c10 @ 60WP) among those not used by KLFitter

Background estimation done with the ABCD method

Independent variables used:

• 
• : number of b-tagged jets (MV2c10 @ 60% WP)
• Where () is the mass of the 3 jets (2 light-jets) forming one of the top-quarks (Ws) in the ttbb events

Definitions of Control Region (CR) and Signal Region (SR) used in the ABCD method

	CR A	CR B
	CR C	SR D

List of meetings at MPP

| Date | Indico link

24/11/2021	https://indico.cern.ch/event/1070855/	Status update talk given by Nina in the Xsec meeting
17/11/2021	https://indico.cern.ch/event/1070854/	Definition of extra b-jets talk given by Teresa in Xsec. meeting
18/06/2021	https://indico.mpp.mpg.de/event/8260/	ABDC and new sample mj - MC studies (Nina)
02/06/2021	https://indico.cern.ch/event/1023083/	Status update talk given by Margherita in the top Xsec meeting
22/04/2021	https://indico.cern.ch/event/1029834/	1T KLfitter and Chi2 results presented by Margherita in the top Reco meeting
17/03/2021	https://indico.mpp.mpg.de/event/8030	1T KLFitter results (Margherita) - Comparison of correction ration-values(Nina)
03/03/2021	https://indico.mpp.mpg.de/event/8000	ATLAS style macro, ABCD/BDT methods (Nina)
24/02/2021	https://indico.mpp.mpg.de/event/7917/	MadGraph (Teresa), Status 1T +Uncertainty on the efficiency (Margherita) ABCD distributions (Nina)
17/02/2021	https://indico.mpp.mpg.de/event/7953/	ABCD distributions (Nina)
10/02/2021	https://indico.mpp.mpg.de/event/7918/	MadGraph Stsudies (teresa), ABCD studies (Nina)
03/02/2021	https://indico.mpp.mpg.de/event/7917/	Status 1T KLfitter (Margherita), ABCD distributions (Nina)
27/01/2021	https://indico.mpp.mpg.de/event/7897/	ABCD studies (Nina)
20/01/2021	https://indico.mpp.mpg.de/event/7866/	-
13/01/2021	https://indico.mpp.mpg.de/event/7848/	-
18/12/2020	https://indico.mpp.mpg.de/event/7826/	Single-T results (Margherita); ttbar background-studies and TOPQ4 derivation (Nina)
04/12/2020	https://indico.mpp.mpg.de/event/7757/	Single T results (Margherita); pt cut studies and continuous btagging (Nina)
26/11/2020	https://indico.mpp.mpg.de/event/7718/	Meeting with Mike Fenton
25/11/2020	https://indico.mpp.mpg.de/event/7756/	-
18/11/2020	https://indico.mpp.mpg.de/event/7698/	-
11/11/2020	https://indico.mpp.mpg.de/event/7697/	Bug fix (Margherita); et_truthParton studies	first ABCD bckg studies (Nina)
28/10/2020	https://indico.mpp.mpg.de/event/7664/	jet_truthParton studies (Nina)
21/10/2020	https://indico.mpp.mpg.de/event/7663/	-
14/10/2020	https://indico.mpp.mpg.de/event/7646/	-
02/10/2020	https://indico.mpp.mpg.de/event/7599/	-
23/09/2020	https://indico.mpp.mpg.de/event/7598/	-
16/09/2020	https://indico.mpp.mpg.de/event/7572/	-
09/09/2020	https://indico.mpp.mpg.de/event/7571/	-
02/09/2020	https://indico.mpp.mpg.de/event/7559/	-
31/07/2020	https://indico.mpp.mpg.de/event/7535/	-
24/07/2020	https://indico.mpp.mpg.de/event/7525/	-
14/07/2020	https://indico.mpp.mpg.de/event/7497/	-
29/06/2020	https://indico.mpp.mpg.de/event/7467/	-
22/06/2020	https://indico.mpp.mpg.de/event/7456/	-
12/06/2020	https://indico.mpp.mpg.de/event/7429/	-
29/05/2020	https://indico.mpp.mpg.de/event/7407/	Sven's talk on the production of Multi-b background events
20/05/2020	https://indico.mpp.mpg.de/event/7389/	-
13/05/2020	https://indico.mpp.mpg.de/event/7373/	-
06/05/2020	https://indico.mpp.mpg.de/event/7344/	-
27/04/2020	https://indico.mpp.mpg.de/event/7328/	-
15/04/2020	https://indico.mpp.mpg.de/event/7300/	-
06/04/2020	https://indico.mpp.mpg.de/event/7285/	Full stat. KLfitter vs Chi2 studies (Margherita) - Full stat. Chi2 studies (NIna)
30/03/2020	https://indico.mpp.mpg.de/event/7274/	Sigma over RMT in chi2 studies
23/03/2020	https://indico.mpp.mpg.de/event/7259/	Further chi2 studies (Margherita) - Initial chi2 studies (Nina)
18/03/2020	https://indico.mpp.mpg.de/event/7248/	KLfitter 408 vs 3210 thruth comparisons and initial chi2 studies (Margherita)
10/03/2020	https://indico.mpp.mpg.de/event/7230/	KLfitter efficiency/purity studies (Margherita) - KLfitter option definitions (Nina)
25/02/2020	https://indico.mpp.mpg.de/event/7214/	KLFitter Time consumption, trigger
18/02/2020	https://indico.mpp.mpg.de/event/7205/	KLFitter, b-jet investigations
04/02/2020	https://indico.mpp.mpg.de/event/7183/	-
20/01/2020	https://indico.mpp.mpg.de/event/7152/	-
10/01/2020	https://indico.mpp.mpg.de/event/7127/	-
04/11/2019	https://indico.mpp.mpg.de/event/6987/	-
23/10/2019	https://indico.mpp.mpg.de/event/6920/	KLFitter, Multijet-Bkg
02/10/2019	https://indico.mpp.mpg.de/event/6895/	Data-MC comparison
25/09/2019	https://indico.mpp.mpg.de/event/6885/	Data-MC comparison
10/09/2019	https://indico.mpp.mpg.de/event/6846/	Status update rehearsal talk for the Top Xsec meeting
08/07/2019	https://indico.mpp.mpg.de/event/6538/	Status update rehearsal talk for the top Xsec meeting
28/06/2019	https://indico.mpp.mpg.de/event/6534/	Cutflow plots
31/05/2019	https://indico.mpp.mpg.de/event/6508/	mass resolution, leptonic ttbb talk, mistagging
10/05/2019	https://indico.mpp.mpg.de/event/6482/	KLFitter, truth matching, purity
03/05/2019	https://indico.mpp.mpg.de/event/6477/	KLFitter
15/04/2019	https://indico.mpp.mpg.de/event/6407/	--
12/03/2019	https://indico.mpp.mpg.de/event/6353/	-
18/02/2019	https://indico.mpp.mpg.de/event/6323/	Trigger comparison
04/02/2019	https://indico.mpp.mpg.de/event/6299/	Trigger comparison
28/01/2019	https://indico.mpp.mpg.de/event/6289/	Trigger efficiency
18/01/2019	https://indico.mpp.mpg.de/event/6269/	Trigger efficiency
14/12/2018	https://indico.mpp.mpg.de/event/6181/	Trigger efficiency
27/11/2018	https://indico.mpp.mpg.de/event/6141/	Update: Trigger, derivaions
12/10/2018	https://indico.mpp.mpg.de/event/6081/	Trigger, derivations
03/08/2018	https://indico.mpp.mpg.de/event/6005/	Summary talk Top X-Sec Meeting
27/06/2018	https://indico.mpp.mpg.de/event/5820/	-
19/06/2018	https://indico.mpp.mpg.de/event/5920/	Sven: Comparison Sherpa and Powhel, Interfacing Powhel with EvtGen +Pythia8
18/05/2018	https://indico.mpp.mpg.de/event/5881/	Meeting with the PowHel people
07/05/2018	https://indico.mpp.mpg.de/event/5869/	Update: Powheg vs. Sherpa at central eta
30/04/2018	https://indico.mpp.mpg.de/event/5862/	Powheg vs. Sherpa at central eta
16/04/2018	https://indico.mpp.mpg.de/event/5835/	Sherpa, Sherpa vs. Powheg+Pythia8
27/03/2018	https://indico.mpp.mpg.de/event/5811/	Sherpa Update
20/03/2018	https://indico.mpp.mpg.de/event/5800	Sherpa Update
09/03/2018	https://indico.mpp.mpg.de/event/5782	Plots with Sherpa Sample
02/03/2018	https://indico.mpp.mpg.de/event/5767	MC Generator record

Link to the MPP Twiki page

* The link to the MPP Twiki page is: https://twiki.mpp.mpg.de/bin/view/Main/Barilla

-- TeresaBarillari - 2021-05-17